| City: | Duncans Mills, California |
| County: | Sonoma County |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 9:57:51 AM |
| Population: | 45 [See All] |
| Area Codes: | 369 / 707 |
| Classification: | PO Box |
| Coordinates: | 38.4508, -123.0557 |
| Land Area: | 0.238 sq mi |
| Quick Link: |
This isn't a border crossing with Mexico, but it functions as a service hub for California's rural northwestern edge. The community spans 6.9 square miles of mixed terrain, where delivery routes combine city carrier service (Route C) with five rural routes. Only 8 street segments receive mail delivery. Most addresses point to PO Boxes because that's the only option available.
The town's street infrastructure tells the story: Highway 116 appears twice in delivery records, Steelhead Boulevard accounts for the most delivery points, and Moscow Road extends into the surrounding countryside. These aren't urban streets with daily postal walks. They're access roads serving scattered properties across heavily forested terrain.
At a median age of 55.8, this is an older community. Census data shows 44 residents identify as white, with minimal diversity beyond that. The 25 occupied housing units house an average of 1.8 people each, typical for older couples and single-person households. Three units sit vacant, though seasonal use patterns aren't documented.
The post office employs 99 people across 18 establishments in the broader ZIP code area, though these numbers likely reflect regional aggregation rather than just Duncans Mills proper. What's clear is that mail service here extends well beyond local boundaries, functioning as an anchor for postal customers across Sonoma County's remote northwestern quadrant.
Street names reflect the area's character as a highway corridor community along the Russian River, with Steelhead Boulevard referencing the region's fishing heritage and Moscow Road hinting at historical settlement patterns. The highway dominates delivery infrastructure, with most addresses requiring PO Box service rather than street delivery.
ZIP Code 95430 has 45 residents and 25 households (average 1.80 persons per household). The median age is 55.8 years, significantly older than the state (37.5) and significantly older than the nation (38.8). The gender split is 57.8% male and 42.2% female, which is much higher than the national male share (49.1%), making this a male-majority area. Largest groups are White (97.8%, much higher than the state average of 41.2% and well above the national average of 61.6%) and Black or African American (0.0%, much lower than the national average of 12.4%); Hispanic or Latino residents make up 0.0%, which is much lower than the state average (39.4%).
Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship
| 2020 Population: | 45Source: Census DHC |
| 2024 ACS Population Estimate: | 0Source: Census ACS |
| 2026 ZC Population Estimate: | 0Source: ZIP-Codes.com |
| Population Density: | 189.1 people per sq mile |
| Average Income: | $0Source: Census ACS |
| Households: | 25Source: Census DHC |
| Average House Value: | $666,666,666Source: Census ACS |
| Persons Per Household: | 1.80Source: Census DHC |
| Average Family Size: | 2.37Source: Census ACS |
| Group | 2010 | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census ACS Population Estimate | -- | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 7 | 7 | 13 | 15 | 0 | 0 | 0 |
| Decennial Census | 44 | -- | -- | -- | -- | -- | -- | -- | -- | -- | 45 | -- | -- | -- | -- |
Median Age: 55.8
Male Median Age: 64
Female Median Age: 39.5
| 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 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 1 | 0 | 4 | 5 | 6 | 0 | 0 | 5 | 0 |
| Female | 3 | 1 | 0 | 2 | 1 | 0 | 2 | 1 | 0 | 1 | 4 | 1 | 1 | 0 | 0 | 1 | 1 | 0 |
| Total | 4 | 2 | 0 | 2 | 1 | 0 | 2 | 4 | 0 | 2 | 4 | 5 | 6 | 6 | 0 | 1 | 6 | 0 |
| White: | 44 | 100.00% |
| Black: | 0 | 0% |
| Hispanic:* | 0 | 0% |
| Asian: | 0 | 0% |
| American Indian: | 0 | 0% |
| Hawaiian: | 0 | 0% |
| Other: | 0 | 0% |
| Total: | 44 | 100% |
| Gender | Count | % | Median Age |
|---|---|---|---|
| Males: | 26 | 57.78% | 64.0 years |
| Females: | 19 | 42.22% | 39.5 years |
| Total: | 45 | 100% | 55.8 years |
| Native, born in the United States: | 0 | 0% |
| Native, born in PR, Island Areas, or abroad: | 0 | 0% |
| Foreign born, naturalized U.S. citizen: | 0 | 0% |
| Foreign born, not a U.S. citizen: | 0 | 0% |
| Total Population: | 0 | 100% |
| Total Native Population: | 0 | 0% |
| Total Foreign-born Population: | 0 | 0% |
In 2024, the median home value is $0, which is much lower than the national median ($332,700), and above its 2019 pre-pandemic level by $0. The median gross rent is $0, which is well under the national median ($1,413), and above its 2019 pre-pandemic level by $0. Insufficient data for owner/renter mix. Insufficient data for vacancy rate.
Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Home Value | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Less than $500: | 0 | 0% |
| $500 to $999: | 0 | 0% |
| $1,000 to $1,499: | 0 | 0% |
| $1,500 to $1,999: | 0 | 0% |
| $2,000 to $2,499: | 0 | 0% |
| $2,500 to $2,999: | 0 | 0% |
| $3,000 or more: | 0 | 0% |
| No Rent: | 0 | 0% |
| Total: | 0 | 100% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Median Rent | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Owner Occupied (with mortgage): | 0 | 0% |
| Owner Occupied (free and clear, no mortgage): | 0 | 0% |
| Renter Occupied: | 0 | 0% |
| Total Occupied Housing Units: | 0 | 100% |
| Occupied Housing Units: | 0 | 0.00% |
| Vacant Housing Units (not graphed): | 16 | 100.00% |
| Total Housing Units: | 16 | 100% |
| Single-Family Units: | 16 | 100.00% |
| Multi-Family Units: | 0 | 0.00% |
| Other Units: | 0 | 0% |
| Total Housing Units: | 16 | 100% |
In 2024, -666,666,666.00% of adults (25+) have a bachelor's degree or higher, which is far lower than the national rate (35.70%). High school or higher is -666,666,666.00%, which is far lower than the national rate (89.60%). The uninsured rate is -666,666,666.00%, which is far lower than the national rate (8.40%). Private coverage is -666,666,666.00%, which is far lower than the national rate (67.10%). Public coverage is -666,666,666.00%, which is far lower than the national rate (36.70%). The share of people in poverty is -666,666,666.00%, which is far lower than the national rate (8.80%). Poverty has been broadly stable, which may reflect structural barriers or offsetting gains and setbacks. Insufficient data for school enrollment.
Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment
| Less than 9th grade: | 0 | 0% |
| 9th to 12th grade, no diploma: | 0 | 0% |
| High school graduate (includes equivalency): | 0 | 0% |
| Some college, no degree: | 0 | 0% |
| Associate's degree: | 0 | 0% |
| Bachelor's degree: | 0 | 0% |
| Graduate or professional degree: | 0 | 0% |
| Total: | 0 | 100% |
| High school or higher: | 0 | 0% |
| Bachelor's degree or higher: | 0 | 0% |
| Private Insurance: | 0 | 0% |
| Public Insurance: | 0 | 0% |
| No Insurance: | 0 | 0% |
| Total: | 0 | 100% |
| Has Health Insurance: | 0 | 0% |
| Group | 2011 | 2102 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % of People in Poverty | 0.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | -666,666,666.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% |
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.
| Nursery School, Preschool: | 0 | 0% |
| Kindergarten: | 0 | 0% |
| Elementary school (grades 1-8): | 0 | 0% |
| High school (grades 9-12): | 0 | 0% |
| College or graduate school: | 0 | 0% |
| Total: | 0 | 100% |
| Early Childhood: | 0 | 0% |
| K-12 (Primary & Secondary School): | 0 | 0% |
ZIP Code 95430 supports both business and residential activity. According to the Business Census (2024), there are 18 business establishments, employing about 99 people with an annual payroll of $3,651,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 158Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 18Source: CBP |
| 1st Quarter Payroll: | $861,000Source: CBP |
| Annual Payroll: | $3,651,000Source: CBP |
| # of Employees: | 99Source: CBP |
ZIP Code 95430 is located in Sonoma County, California, within the Santa Rosa-Petaluma, CA Metropolitan Statistical Area (CBSA 42220) and California's 2nd Congressional District. This Metro area has a population of 483,878 people, about 0.01% of whom live in ZIP Code 95430. It covers 0.238 sq mi of land and a water area of 0.129 sq mi.
| CBSA Name: | Santa Rosa-Petaluma, CASource: Census |
| CBSA Number: | 42220Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 483,878Source: Census |
| MSA: | San Francisco-Oakland-San Jose, CA CMSASource: Census |
| Land Area: | 0.238 sq miSource: Census |
| Water Area: | 0.129 sq miSource: Census |
| Congressional District: | 02Source: USPS |
| Congressional Land Area: | 12952.23 sq miSource: Census |
| PMSA: | Santa Rosa, CA PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | --Source: Census |
| Place Name: | --Source: Census |
We could not locate which school district 95430 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.