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Population & Demographics

ZIP Code 40121 has 7,749 residents and 2,104 households (average 3.08 persons per household). The median age is 23.9 years, significantly younger than the state (39.4) and significantly younger than the nation (38.8). The gender split is 53.8% male and 46.2% female, which is higher than the national male share (49.1%), making this a male-majority area. Largest groups are White (57.3%, much lower than the state average of 82.4%) and Black or African American (18.1%, much higher than the state average of 8.0%); Hispanic or Latino residents make up 17.9%, which is much higher than the state average (4.6%), and Black or African American share is much higher than the state average (8.0%).

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 2011-2023 American Community Survey (ACS) 5-Year Estimates.

2020 Population:	7,749Source: Census DHC
2023 ACS Population Estimate:	8,715Source: Census ACS
2025 ZC Population Estimate:	8,833Source: ZIP-Codes.com
Population Density:	220.0 people per sq mile
Average Income:	$74,224Source: Census ACS

Households:	2,104Source: Census DHC
Average House Value:	$0Source: Census ACS
Persons Per Household:	3.08Source: Census DHC
Average Family Size:	2.51Source: Census ACS

Population Over Time (with 2010 & 2020 Census Benchmarks)

Line chart of ZIP 40121 population estimates from 2011-2023, 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	--	11,308	10,946	10,555	10,271	9,449	9,226	9,092	8,965	8,695	8,865	8,916	8,655	8,715
Decennial Census	10,124	--	--	--	--	--	--	--	--	--	7,749	--	--	--

Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

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

Median Age: 23.9

Male Median Age: 23.5

Female Median Age: 24.8

Line chart for ZIP 40121 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	351	426	339	382	755	454	338	349	268	191	109	70	57	22	31	9	8	11
Female	340	424	352	312	379	263	367	364	252	162	128	85	61	33	31	4	10	12
Total	691	850	691	694	1,134	717	705	713	520	353	237	155	118	55	62	13	18	23

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 40121. Table below includes counts and percentages. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

White:	4,439	54.47%
Black:	1,402	17.20%
Hispanic:*	1,386	17.01%
Asian:	261	3.20%
American Indian:	62	0.76%
Hawaiian:	125	1.53%
Other:	475	5.83%
Total:	8,150	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 40121. Chart loads automatically and replaces this content. Load Chart Manually (if needed)

Gender	Count	%	Median Age
Males:	4,170	53.81%	23.5 years
Females:	3,579	46.19%	24.8 years
Total:	7,749	100%	23.9 years

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

Nativity & Citizenship

Pie chart showing nativity in ZIP 40121. 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:	7,700	88.35%
Native, born in PR, Island Areas, or abroad:	538	6.17%
Foreign born, naturalized U.S. citizen:	259	2.97%
Foreign born, not a U.S. citizen:	218	5.47%
Total Population:	8,715	100%
Total Native Population:	8,238	94.53%
Total Foreign-born Population:	477	5.47%

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 $74,224, which is far above the state median ($62,417), is up $24,224 (48.4%) since 2011 and above its 2019 pre-pandemic level by $14,901. Family households earn a median of $74,353 versus $67,887 for nonfamily households (a difference of $6,466). By gender, male median income is $42,471 and female is $44,870, which is considerably lower than the national female median ($53,445), with a current gap of $2,399 that has narrowed from 2011 to 2023. The labor-force participation rate is 173.2%, which is far greater than the state rate (59.6%). The unemployment rate is 3.6%, which is generally lower than the national rate (5.2%). The largest occupation group is Management (39.6%).

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 40121 from 2011-2023 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	$50,000	$49,398	$51,711	$50,988	$51,820	$53,870	$55,196	$60,367	$59,323	$63,119	$70,441	$76,864	$74,224
Median Family Income	$51,336	$51,810	$53,200	$52,581	$54,019	$56,522	$57,762	$62,387	$64,180	$66,583	$81,600	$84,063	$74,353
Median NonFamily Income	$39,324	$42,390	$48,397	$43,235	$42,931	$43,268	$43,750	$45,996	$41,042	$46,719	$58,452	$62,829	$67,887
Median Male Income	$30,444	$29,762	$28,734	$27,909	$29,689	$34,019	$37,189	$43,185	$47,909	$43,147	$41,261	$41,976	$42,471
Median Female Income	$29,320	$27,568	$30,000	$36,250	$35,703	$36,883	$39,663	$42,026	$42,167	$37,009	$38,788	$42,404	$44,870

Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income

Bar chart showing average household income comparing ZIP 40121, city of Fort Knox, Hardin County, state of Kentucky, 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 40121, 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:	1,504	53.56%
Unemployed:	175	6.23%
Not In Labor Force:	1,129	40.21%
Total:	2,808	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:	596	39.63%
Service:	232	15.43%
Sales and Office:	378	25.13%
Natural resources, construction, and maintenance:	94	6.25%
Production, transportation, and material moving:	204	13.56%
Total Civilian Employed Population:	1,504	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 $0, which is considerably lower than the state median ($192,300), and above its 2019 pre-pandemic level by $0. The median gross rent is $1,234, which is markedly greater than the state median ($933), is up $197 (19.00%) since 2011 and above its 2019 pre-pandemic level by $144. Of occupied housing, owners make up 0.73% (0.00% with a mortgage, 100.00% free-and-clear) and renters 99.27% - making this ZIP Code less home ownership than the state and higher than national rental averages. The vacancy rate is 10.78%, which is far higher than the national rate (10.43%).

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

Source: U.S. Census 2011-2023 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 40121, compared with Fort Knox, Hardin County, state of Kentucky, 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 40121 across years 2011-2023 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	$0	$135,600	$0	$0	$0	$0	$0	$0	$0	$0	$0	$0	$0

Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Gross Rent Paid

Pie chart of gross rent for renter-occupied homes in ZIP 40121, 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:	153	7.00%
$500 to $999:	286	13.08%
$1,000 to $1,499:	962	44.01%
$1,500 to $1,999:	586	26.81%
$2,000 to $2,499:	151	6.91%
$2,500 to $2,999:	0	0.00%
$3,000 or more:	6	0.27%
No Rent:	42	1.92%
Total:	2,186	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 40121 over the years 2011-2023 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	$1,037	$1,087	$1,115	$1,184	$1,168	$1,146	$1,137	$1,135	$1,090	$1,046	$1,114	$1,178	$1,234

Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Housing Occupancy

Pie chart showing housing occupancy for ZIP 40121. 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):	0	0.00%
Owner Occupied (free and clear, no mortgage):	16	0.73%
Renter Occupied:	2,186	99.27%
Total Occupied Housing Units:	2,202	100%

Occupied Housing Units:	2,202	89.22%
Vacant Housing Units (not graphed):	266	10.78%
Total Housing Units:	2,468	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 40121. 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:	1,824	73.91%
Multi-Family Units:	640	25.93%
Other Units:	4	0.16%
Total Housing Units:	2,468	100%

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

Education, Health & Community

In 2023, 42.10% of adults (25+) have a bachelor's degree or higher, which is markedly above the state rate (27.00%), well above both the state and national averages. High school or higher is 95.70%, which is markedly above the state rate (88.50%). The uninsured rate is 4.80%, which is falls below the national rate (8.60%). Private coverage is 87.90%, which is notably higher than the state rate (63.30%). Public coverage is 17.00%, which is markedly below the state rate (44.40%). The share of people in poverty is 9.70%, which is on par with the state rate (11.80%), up 4.90 percentage points since 2011 and above its 2019 pre-pandemic level by 3.60 percentage points. This signals a sharp increase in hardship - a shrinking consumer base, heavy pressure on public services, and job-market contraction risks. Among residents ages 3+, the largest enrollment group is elementary (45.96%). College enrollment is 23.76%, 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 2011-2023 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 40121, 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:	88	2.06%
9th to 12th grade, no diploma:	97	2.28%
High school graduate (includes equivalency):	522	12.25%
Some college, no degree:	1,109	26.02%
Associate's degree:	652	15.30%
Bachelor's degree:	1,116	26.18%
Graduate or professional degree:	678	15.91%
Total:	4,262	100%
High school or higher:	4,077	95.66%
Bachelor's degree or higher:	1,794	42.09%

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 40121. 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:	4,836	80.12%
Public Insurance:	934	15.47%
No Insurance:	266	4.41%
Total:	6,036	100%
Has Health Insurance:	5,770	95.59%

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

Percentage of People in Poverty Over Time (2011-2023)

Line chart displaying the share of families and people in ZIP 40121 whose income falls below the federal poverty threshold, using ACS 5-year estimates from 2011 through 2023. 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	4.8%	5.2%	7.0%	8.7%	8.8%	9.8%	12.3%	8.1%	6.1%	5.6%	4.0%	3.1%	9.7%

Source: U.S. Census 2011-2023 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:	511	17.19%
Kindergarten:	98	3.30%
Elementary school (grades 1-8):	1,366	45.96%
High school (grades 9-12):	291	9.79%
College or graduate school:	706	23.76%
Total:	2,972	100%
Early Childhood:	609	20.49%
K-12 (Primary & Secondary School):	1,755	59.05%

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

City:	Fort Knox, Kentucky
Counties:	Hardin County[Primary] Meade County
Timezone:	Eastern (GMT -05:00)
Local Time:	11:21:28 PM
Population:	7,749 [See All]
Area Code:	502
Classification:	Standard [Normal Street Delivery]
Coordinates:	37.8700, -85.9326
Land Area:	35.221 sq mi
Quick Link:	https://www.zip-codes.com/zip-code/40121/zip-code-40121.asp

# Residential Mailboxes:	2,868Source: USPS
# Business Mailboxes:	52Source: USPS
Total Delivery Receptacles:	3,134Source: USPS
Single Family Delivery Units:	1,660Source: USPS
Multi Family Delivery Units:	278Source: USPS

# of Businesses:	55Source: CBP
1st Quarter Payroll:	$12,834,000Source: CBP
Annual Payroll:	$55,488,000Source: CBP
# of Employees:	1,015Source: CBP

CBSA Name:	Elizabethtown, KYSource: Census
CBSA Number:	21060Source: Census
CBSA Type:	MetroSource: Census
CBSA Division:	--Source: Census
CBSA Population:	126,480Source: Census
MSA:	Source: Census
Land Area:	35.221 sq miSource: Census
Water Area:	0.075 sq miSource: Census

Congressional District:	02Source: USPS
Congressional Land Area:	7177.44 sq miSource: Census
PMSA:	Source: Census
Intro Date:	< 2004-10Source: ZIP-Codes.com
Place FIPS Code:	2128540Source: Census
Place Name:	Fort Knox CDP; KentuckySource: Census

ZIP Code 40121 in Fort Knox, KY

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 (2011-2023)

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 40121

Colleges & Post Secondary Schools near ZIP Code 40121

Sources & References