92391 Twin Peaks, CA - San Bernardino Mountains Community

ZIP Code 92391, Twin Peaks

Tourism Gateway

LocationSan Bernardino County, CA

Area1.9 sq mi

Population2,239

Households891

PO Boxes952 (107% adoption)

Median Age40.6 years

Seasonal Housing28%

ZIP CreatedBefore Oct 2004

Key Facts

This is a PO Box Only Zone and there is no street delivery across the 1.9 square mile mountain territory
The post office maintains 952 PO Boxes serving 891 occupied homes, with slight regional service (1.07 adoption rate)
Of 1,386 housing units, 384 (27.7%) are used seasonally or for recreation, reflecting mountain retreat character
Work-from-home rate of 29% is notably higher than most communities, suited to remote mountain living
Transportation and warehousing employs 562 workers, while 376 work for federal government, the two dominant employment sectors

Mountain Mail Access Point

Twin Peaks sits at over 6,000 feet elevation in the San Bernardino Mountains, a small community of 2,239 residents spread across 1.9 square miles. This is a PO Box Only Zone. No street delivery exists here, making the post office the sole mail access point for residents across the mountain area.

The post office maintains 952 PO Boxes for 891 occupied homes, an adoption rate of 1.07 that indicates service extending slightly beyond the immediate community. While most boxes serve local households, the post office also handles mail for seasonal visitors and nearby mountain properties.

Mountain Character

Street names like Alpine Lane, Sierra Vista Drive, and Grandview Road capture the mountain character, while State Highway 189 serves as the main corridor through town. The 57 distinct street names include Lake Forest Drive, Sunset Loop, and Sky Ridge Drive, all emphasizing the mountain and scenic nature of the area. Three streets show apartment units (State Highway 189, Grandview Road, and Sierra Vista Drive), but multi-family housing remains limited.

A Seasonal Mountain Community

Housing in Twin Peaks reflects its mountain retreat character. Of 1,386 total housing units, 495 stand vacant, with 384 classified as seasonal or recreational use. That's 27.7% seasonal occupancy. Home values run to a median of $313,100, while median household income sits at $70,987. The population skews older, with a median age of 40.6 years. The owner-occupancy rate reaches 70% (627 of 891 occupied units).

Mixed Delivery Infrastructure

Mail delivery combines rural and limited city carrier routes. The vast majority of addresses receive service through one rural route (127 ZIP+4 records), with minimal city carrier coverage (2 records). General delivery is available. The 953 residential delivery points consist almost entirely of single-family homes, with just 50 business delivery points serving the community's 56 establishments employing 200 workers.

Economic and Demographic Profile

Work patterns show 29% of workers operating from home, notably higher than typical communities. Transportation and warehousing employ 562 workers, the dominant sector, while 376 work for federal government. The education level stands at 18.4% with bachelor's degrees or higher.

The racial composition stands at 67% White alone (1,503 residents), 16% Some Other Race (357), and 12% Two or More Races (276). Hispanic or Latino residents number 248 (11% of population). The population consists of typical family households with a ratio of 2.51 persons per household.

Mailing to Twin Peaks

All mail must be addressed to PO Boxes:

[Recipient Name]
PO Box [Number]
Twin Peaks, CA 92391

Street addresses do not receive delivery. Twin Peaks functions as a quiet mountain residential community where PO Boxes aren't optional.

Street Name Patterns

Mountain Names Scenic Views Nature References

Street names emphasize mountain elevation and scenic character: Alpine, Sierra Vista, Grandview, Sky Ridge, Sunset Loop.

Nearby Areas

Wildwood Park North Park DRNAG Verdemont Belevedere

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Population & Demographics

ZIP Code 92391 has 2,239 residents and 891 households (average 2.51 persons per household). The median age is 40.6 years, older than the state (37.5) and slightly older than the nation (38.8). The gender split is 51.5% male and 48.5% female, which is slightly higher than the national male share (49.1%), making this a male-majority area. Largest groups are White (67.1%, much higher than the state average of 41.2%) and Hispanic or Latino (34.1%); Hispanic or Latino residents make up 34.1%, which is much higher than the national average (18.7%).

Explore More:Population Over Time By Age & Gender By Race By Gender Nativity & Citizenship

Source: U.S. Census 2020 Demographics & Housing Characteristics (DHC) and U.S. Census 2011-2024 American Community Survey (ACS) 5-Year Estimates.

2020 Population:	2,239Source: Census DHC
2024 ACS Population Estimate:	2,192Source: Census ACS
2026 ZC Population Estimate:	0Source: ZIP-Codes.com
Population Density:	1,131.4 people per sq mile
Average Income:	$70,987Source: Census ACS

Households:	891Source: Census DHC
Average House Value:	$313,100Source: Census ACS
Persons Per Household:	2.51Source: Census DHC
Average Family Size:	3.19Source: Census ACS

Population Over Time (with 2010 & 2020 Census Benchmarks)

Line chart of ZIP 92391 population estimates from 2011-2024, with markers for the 2010 and 2020 Decennial Census counts to show growth or decline over time. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Group	2010	2011	2102	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023
Census ACS Population Estimate	--	1,909	2,335	2,693	3,001	3,123	3,227	2,738	2,479	1,959	2,263	1,996	2,177	2,192
Decennial Census	2,534	--	--	--	--	--	--	--	--	--	2,239	--	--	--

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

Population by Age & Gender (Total, Male, Female)

Median Age: 40.6

Male Median Age: 40.3

Female Median Age: 41

Line chart for ZIP 92391 showing total, male, and female population by age group. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Group	< 5	5-9	10-14	15-19	20-24	25-29	30-34	35-39	40-44	45-49	50-54	55-59	60-64	65-69	70-74	75-79	80-84	85+
Male	62	57	78	81	64	79	73	78	53	42	94	108	79	78	64	38	15	9
Female	41	71	60	82	77	71	76	54	58	44	83	77	103	90	59	20	10	11
Total	103	128	138	163	141	150	149	132	111	86	177	185	182	168	123	58	25	20

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Pie Chart & Table Comparison Chart

Population by Race

Pie chart of the racial and ethnic makeup of ZIP 92391. Table below includes counts and percentages. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

White:	1,503	55.14%
Black:	29	1.06%
Hispanic:*	763	27.99%
Asian:	42	1.54%
American Indian:	29	1.06%
Hawaiian:	3	0.11%
Other:	357	13.10%
Total:	2,726	100%

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

* NOTE: Hispanic or Latino is an ethnicity, not a race. This means individuals who identify as Hispanic will also be included in one of the race categories (such as White or Black). As a result, the totals shown here may exceed 100% when Hispanic is displayed alongside racial groups.

Pie Chart & Table Comparison Chart

Gender Breakdown

Simple chart showing male vs female share of the population in ZIP Code 92391. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Gender	Count	%	Median Age
Males:	1,152	51.45%	40.3 years
Females:	1,087	48.55%	41.0 years
Total:	2,239	100%	40.6 years

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Nativity & Citizenship

Pie chart showing nativity in ZIP 92391. Categories include native residents (born in the United States, Puerto Rico, U.S. Island Areas, or abroad to American parents) and foreign-born residents. A table below lists counts and percentages. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Native, born in the United States:	1,722	78.56%
Native, born in PR, Island Areas, or abroad:	0	0.00%
Foreign born, naturalized U.S. citizen:	160	7.30%
Foreign born, not a U.S. citizen:	310	21.44%
Total Population:	2,192	100%
Total Native Population:	1,722	78.56%
Total Foreign-born Population:	470	21.44%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Note: Nativity and Citizenship derived from American Community Survey (ACS) 5-year estimates. Total Population listed here will not match official ZIP Code population totals, which are based on the Decennial Census.

Income & Employment

In 2023, the Median household income is $70,987, which is much lower than the state median ($96,334), is up $33,386 (88.8%) since 2011 and above its 2019 pre-pandemic level by $22,754. Family households earn a median of $83,675 versus $23,794 for nonfamily households (a difference of $59,881). By gender, male median income is $40,779 and female is $29,947, which is well under the state female median ($61,569), with a current gap of $10,832 that has narrowed from 2011 to 2023. The labor-force participation rate is 58.8%, which is falls short of the state rate (63.9%). The unemployment rate is 3.9%, which is much lower than the state rate (6.4%). The largest occupation group is Management (51.2%).

Explore More:Income Over Time Household Income Employment Status By Occupation

Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. Using data from Tables DP02, DP03, DP04 and DP05.

Median Income Over Time (Household, Family, Nonfamily, Male, Female)

Line chart showing median income in ZIP 92391 from 2011-2024 for five series: household, family, nonfamily, male, and female. The table below lists the yearly values. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Income Type	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023
Median Household Income	$37,601	$39,519	$41,042	$37,150	$49,182	$50,492	$48,063	$43,523	$48,233	$44,298	$75,117	$75,296	$70,987
Median Family Income	$38,108	$41,571	$47,705	$41,389	$0	$51,375	$51,250	$42,300	$48,879	$44,914	$76,127	$80,564	$83,675
Median NonFamily Income	$26,161	$25,313	$28,036	$25,438	$26,250	$0	$0	$0	$0	$0	$18,625	$18,451	$23,794
Median Male Income	$45,685	$48,542	$51,848	$51,741	$51,034	$50,991	$44,875	$42,023	$43,982	$36,629	$36,208	$38,625	$40,779
Median Female Income	$32,419	$40,556	$43,750	$34,200	$47,031	$46,968	$50,083	$50,213	$51,406	$0	$24,277	$26,880	$29,947

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income

Bar chart showing average household income comparing ZIP 92391, city of Twin Peaks, San Bernardino County, state of California, and United States national values. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Pie Chart & Table Comparison Chart

Employment Status

Pie chart of employment status for ZIP 92391, showing the shares who are employed, unemployed, and not in the labor force. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Employed:	989	54.49%
Unemployed:	42	2.31%
Not In Labor Force:	784	43.20%
Total:	1,815	100%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment by Occupation (Civilian Employed Population, 16 and Over)

Donut Chart showing the distribution of employed civilians aged 16 and over by occupation category: management, service, sales and office, natural resources and construction, and production and transportation. A table with the same data and percentages is provided as well.Load Chart Manually (if needed)

Management, business, science, and arts:	506	51.16%
Service:	272	27.50%
Sales and Office:	112	11.32%
Natural resources, construction, and maintenance:	81	8.19%
Production, transportation, and material moving:	18	1.82%
Total Civilian Employed Population:	989	100%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS.

Housing & Affordability

In 2023, the median home value is $313,100, which is far less than the state median ($695,400), is up $90,400 (40.59%) since 2011 and above its 2019 pre-pandemic level by $46,000. The median gross rent is $1,473, which is well under the state median ($1,956), is up $205 (16.17%) since 2011 and above its 2019 pre-pandemic level by $706. Of occupied housing, owners make up 71.41% (69.21% with a mortgage, 30.79% free-and-clear) and renters 28.59% - making this ZIP Code more home ownership than the state and under national rental averages. The vacancy rate is 38.23%, which is far higher than the state rate (7.55%).

Explore More:Compare Home Value Home Value Over Time Rent & Over Time Housing Occupancy

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Table DP03, SELECTED ECONOMIC CHARACTERISTICS.

Median Home Value (Comparison)

Bar chart showing the median home value for ZIP 92391, compared with Twin Peaks, San Bernardino County, state of California, and the U.S. National Average. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Home Value Over Time

Line chart showing median home values for ZIP 92391 across years 2011-2024 using ACS 5-year estimates. The chart displays the typical dollar value of owner-occupied housing units. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Group	2011	2102	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023
Median Home Value	$222,700	$177,900	$211,900	$214,200	$229,900	$256,500	$267,400	$267,200	$267,100	$262,300	$277,100	$306,300	$313,100

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Gross Rent Paid

Pie chart of gross rent for renter-occupied homes in ZIP 92391, showing monthly rent brackets and the share of units in each range. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Less than $500:	92	33.70%
$500 to $999:	0	0.00%
$1,000 to $1,499:	50	18.32%
$1,500 to $1,999:	33	12.09%
$2,000 to $2,499:	0	0.00%
$2,500 to $2,999:	60	21.98%
$3,000 or more:	38	13.92%
No Rent:	0	0.00%
Total:	273	100%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Gross Rent Over Time

Line chart displaying median gross rent for ZIP 92391 over the years 2011-2024 using ACS 5-year estimates. The chart represents typical monthly housing costs for renter households. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Group	2011	2102	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023
Median Rent	$1,268	$1,154	$1,315	$1,165	$1,180	$1,068	$1,009	$786	$767	$894	$736	$0	$1,473

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Housing Occupancy

Pie chart showing housing occupancy for ZIP 92391. Categories include owner-occupied units with a mortgage, owner-occupied units free and clear, and renter-occupied units. A table below lists counts and percentages. Vacant housing units are shown separately in the Vacancy chart. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Owner Occupied (with mortgage):	472	49.42%
Owner Occupied (free and clear, no mortgage):	210	21.99%
Renter Occupied:	273	28.59%
Total Occupied Housing Units:	955	100%

Occupied Housing Units:	955	61.77%
Vacant Housing Units (not graphed):	591	38.23%
Total Housing Units:	1,546	100%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Housing Type (Single-Family, Multi-Family, Other)

Pie chart showing housing type distribution for ZIP 92391. Categories include single-family units (detached or attached), multi-family units (from 2 units up to 50 or more units), and other structures such as mobile homes or boats/RVs. A table below lists counts and percentages for each group.Load Chart Manually (if needed)

Single-Family Units:	1,299	84.02%
Multi-Family Units:	130	8.41%
Other Units:	117	7.57%
Total Housing Units:	1,546	100%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Education, Health & Community

In 2023, 18.40% of adults (25+) have a bachelor's degree or higher, which is markedly below the state rate (36.50%). High school or higher is 94.50%, which is markedly above the state rate (84.60%). The uninsured rate is 11.80%, which is on par with the state rate (6.90%). Private coverage is 48.20%, which is falls below the national rate (67.30%). The share of people in poverty is 2.80%, which is far lower than the national rate (8.70%), down 8.80 percentage points since 2011 and below its 2019 pre-pandemic level by 16.50 percentage points. This points to a pronounced improvement in local conditions - rising incomes, firmer consumer demand, and a stronger tax base. Among residents ages 3+, the largest enrollment group is elementary (53.85%). College enrollment is 42.91%, which is comparable to the national rate (26.70%), meaning the community mirrors broader higher-education participation.

Explore More:Educational Attainment Health Insurance Poverty Over Time School Enrollment

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02 and DP03.

Educational Attainment of Adults (25 and Older)

Pie chart of educational attainment for adults (25+) in ZIP 92391, including each level from less than 9th grade to graduate/professional. Summary rows show high school or higher and bachelor's or higher. A table lists counts and percentages.Load Chart Manually (if needed)

Less than 9th grade:	31	1.94%
9th to 12th grade, no diploma:	57	3.57%
High school graduate (includes equivalency):	451	28.28%
Some college, no degree:	538	33.73%
Associate's degree:	225	14.11%
Bachelor's degree:	155	9.72%
Graduate or professional degree:	138	8.65%
Total:	1,595	100%
High school or higher:	1,507	94.48%
Bachelor's degree or higher:	293	18.37%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Pie Chart & Table Comparison Chart

Health Insurance Coverage by Type (Private, Public, Uninsured)

Pie chart illustrating health insurance coverage by type for ZIP Code 92391. Categories include private insurance, public coverage such as Medicare and Medicaid, and individuals with no health insurance. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Private Insurance:	1,038	44.90%
Public Insurance:	1,019	44.07%
No Insurance:	255	11.03%
Total:	2,312	100%
Has Health Insurance:	2,057	88.97%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Percentage of People in Poverty Over Time (2011-2024)

Line chart displaying the share of families and people in ZIP 92391 whose income falls below the federal poverty threshold, using ACS 5-year estimates from 2011 through 2024. The chart shows year-to-year changes in the percentage of people in poverty. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Group	2011	2102	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022	2023
% of People in Poverty	11.6%	7.7%	8.6%	17.4%	18.7%	16.9%	20.2%	31.9%	19.3%	16.5%	18.1%	13.2%	2.8%

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.

School Enrollment by Education Level (Ages 3 and Older)

Pie Chart showing enrollment of residents ages 3 and older in Nursery School or Preschool, Kindergarten, Elementary (grades 1-8), High School (grades 9-12), and College or Graduate School. A table with the same data and percentages is provided as well.Load Chart Manually (if needed)

Nursery School, Preschool:	0	0.00%
Kindergarten:	0	0.00%
Elementary school (grades 1-8):	266	53.85%
High school (grades 9-12):	16	3.24%
College or graduate school:	212	42.91%
Total:	494	100%
Early Childhood:	0	0.00%
K-12 (Primary & Secondary School):	282	57.09%

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

City:	Twin Peaks, California
County:	San Bernardino County
Timezone:	Pacific (GMT -08:00)
Local Time:	10:22:53 PM
Population:	2,239 [See All]
Area Codes:	840 / 909
Classification:	PO Box
Coordinates:	34.2422, -117.2312
Land Area:	1.979 sq mi
Quick Link:	https://www.zip-codes.com/zip-code/92391/zip-code-92391.asp

# Residential Mailboxes:	0Source: USPS
# Business Mailboxes:	0Source: USPS
Total Delivery Receptacles:	1,001Source: USPS
Single Family Delivery Units:	0Source: USPS
Multi Family Delivery Units:	0Source: USPS

# of Businesses:	51Source: CBP
1st Quarter Payroll:	$2,428,000Source: CBP
Annual Payroll:	$10,061,000Source: CBP
# of Employees:	171Source: CBP

CBSA Name:	Riverside-San Bernardino-Ontario, CASource: Census
CBSA Number:	40140Source: Census
CBSA Type:	MetroSource: Census
CBSA Division:	--Source: Census
CBSA Population:	4,637,725Source: Census
MSA:	Los Angeles-Riverside-Orange County, CASource: Census
Land Area:	1.979 sq miSource: Census
Water Area:	--Source: Census

Congressional District:	23Source: USPS
Congressional Land Area:	9898 sq miSource: Census
PMSA:	Riverside-San Bernardino, CA PMSASource: Census
Intro Date:	< 2004-10Source: ZIP-Codes.com
Place FIPS Code:	--Source: Census
Place Name:	--Source: Census

ZIP Code 92391 in Twin Peaks, CA

92391 Twin Peaks, CA - San Bernardino Mountains Community

ZIP Code 92391, Twin Peaks

Key Facts

Mountain Mail Access Point

Mountain Character

A Seasonal Mountain Community

Mixed Delivery Infrastructure

Economic and Demographic Profile

Mailing to Twin Peaks

Street Name Patterns

Nearby Areas

Population & Demographics

Population Over Time (with 2010 & 2020 Census Benchmarks)

Population by Age & Gender (Total, Male, Female)

Population by Race

Gender Breakdown

Nativity & Citizenship

Income & Employment

Median Income Over Time (Household, Family, Nonfamily, Male, Female)

Average Household Income

Employment Status

Employment by Occupation (Civilian Employed Population, 16 and Over)

Housing & Affordability

Median Home Value (Comparison)

Median Home Value Over Time

Gross Rent Paid

Median Gross Rent Over Time

Housing Occupancy

Housing Type (Single-Family, Multi-Family, Other)

Education, Health & Community

Educational Attainment of Adults (25 and Older)

Health Insurance Coverage by Type (Private, Public, Uninsured)

Percentage of People in Poverty Over Time (2011-2024)

School Enrollment by Education Level (Ages 3 and Older)

Business & Employment Statistics

Geography, Land Area, & Statistical Classifications

Adjacent & Nearby ZIP Codes

Schools in ZIP Code 92391

Colleges & Post Secondary Schools near ZIP Code 92391

Sources & References