94401 ZIP Code, San Mateo, CA
94401 is a ZIP code in San Mateo, California in San Mateo County. It covers 3.1 square miles of land. The closest ZIP codes are 94402, 94403 and 94010. 35,295 people live here in 13,026 households. It is densely built, at about 11,345 people per square mile, and owners and renters are mixed (43% own). Median household income is $122,227, above the California median of $99,122.
Quick facts
- Mailing city: San Mateo, CA
- County: San Mateo County
- Land area: 3.1 sq mi
- Population: 35,295
- Median household income: $122,227
- Carrier routes: 23 (13,804 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 35,295 |
| Households | 13,026 |
| Median household income | $122,227 |
| Income per person | $63,426 |
| Median age | 35.9 |
| Homeowners | 43.4% |
| Median home value | $1,184,500 |
| Median rent | $2,762 |
| Bachelor's degree or higher | 46.3% |
| Average commute (minutes) | 25.7 |
| Households with kids under 18 | 26.9% |
| Moved in the past year | 12.8% |
| Below the poverty line | 12.2% |
| Broadband internet | 94.7% |
| Speak a non-English language at home | 54.8% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.8% |
| $10–15K | 2.5% |
| $15–25K | 5.2% |
| $25–35K | 3.8% |
| $35–50K | 10.0% |
| $50–75K | 10.0% |
| $75–100K | 9.0% |
| $100–150K | 14.3% |
| $150–200K | 14.5% |
| $200K+ | 27.6% |
Age
| % of all residents | Value |
|---|---|
| <10 | 10.9% |
| 10–19 | 10.7% |
| 20–24 | 6.9% |
| 25–34 | 19.2% |
| 35–44 | 14.0% |
| 45–54 | 11.0% |
| 55–64 | 10.7% |
| 65–74 | 8.7% |
| 75+ | 8.0% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 27.6% |
| Owned outright | 13.5% |
| Rented | 53.2% |
| Vacant | 5.7% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 30.2% |
| Townhome | 8.8% |
| 2–4 units | 6.4% |
| 5–19 units | 19.3% |
| 20+ units | 34.9% |
| Mobile / other | 0.4% |
Businesses in 94401
1,162 business establishments with 15,587 employees (ZIP Codes Business Patterns 2023).
- Health Care and Social Assistance: 289
- Accommodation and Food Services: 178
- Professional, Scientific, and Technical Services: 129
- Other Services (except Public Administration): 97
- Construction: 85
- Retail Trade: 80
- Real Estate and Rental and Leasing: 53
- Administrative and Support and Waste Management and Remediation Services: 49
EDDM carrier routes
94401 has 23 USPS carrier routes with 13,804 residential and 1,268 business mailboxes. Open the EDDM route map.
Carrier routes in 94401
94401 has 23 USPS carrier routes (23 city (C)) with 13,804 residential and 1,268 business mailboxes. Routes range from 193 homes (C034) to 868 homes (C041); the median route has 590 homes. The Census counted 13,026 households in 94401 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 1 |
| 250–499 | 5 |
| 500–749 | 13 |
| 750–999 | 4 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 94401 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C034 — USPS business mailboxes 328, 193 homes
- Route C018 — USPS business mailboxes 190, 539 homes
- Route C024 — USPS business mailboxes 184, 694 homes
- Route C016 — USPS business mailboxes 76, 541 homes
- Route C012 — USPS business mailboxes 70, 820 homes
Select these 5 routes on the route map
Every carrier route in 94401
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C003 | City | 627 | 14 | $181,345 | — | — | — |
| C004 | City | 833 | 15 | $199,209 | — | — | — |
| C005 | City | 475 | 66 | $92,795 | — | — | — |
| C010 | City | 437 | 68 | $187,657 | — | — | — |
| C011 | City | 411 | 2 | $144,394 | — | — | — |
| C012 | City | 820 | 70 | $181,345 | — | — | — |
| C014 | City | 737 | 23 | $144,394 | — | — | — |
| C015 | City | 434 | 3 | $144,282 | — | — | — |
| C016 | City | 541 | 76 | $160,718 | — | — | — |
| C017 | City | 637 | 23 | $200,001+ | — | — | — |
| C018 | City | 539 | 190 | $94,840 | — | — | — |
| C021 | City | 535 | 0 | $153,472 | — | — | — |
| C022 | City | 590 | 15 | $200,001+ | — | — | — |
| C023 | City | 729 | 25 | $87,679 | — | — | — |
| C024 | City | 694 | 184 | $87,679 | — | — | — |
| C026 | City | 689 | 34 | $153,472 | — | — | — |
| C028 | City | 482 | 0 | $153,472 | — | — | — |
| C031 | City | 624 | 5 | $160,718 | — | — | — |
| C033 | City | 552 | 39 | $48,617 | — | — | — |
| C034 | City | 193 | 328 | $94,840 | — | — | — |
| C041 | City | 868 | 60 | $121,743 | — | — | — |
| C042 | City | 801 | 19 | $160,718 | — | — | — |
| C044 | City | 556 | 9 | $106,721 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 94401 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 94402 — San Mateo city, CA (2.5 mi)
- 94403 — San Mateo city, CA (2.7 mi)
- 94010 — Hillsborough town, CA (3 mi)
- 94404 — Foster City city, CA (3.2 mi)
- 94002 — Belmont city, CA (4.4 mi)
- 94065 — Redwood City city, CA (4.8 mi)
- 94128 — South San Francisco city, CA (4.8 mi)
- 94030 — Millbrae city, CA (4.9 mi)
Areas that include 94401
- San Mateo, CA ZIP codes — 4 ZIP codes
- San Mateo County ZIP codes — 31 ZIP codes
- California ZIP code data
Where it ranks
- No. 8 of 28: highest share of residents who moved in during the past year in San Mateo County
- No. 2 of 28: lowest median age in San Mateo County
Mail every home in 94401
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 94401, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 94401 in?
- 94401 is a San Mateo, CA mailing address. By land area, 100% lies inside San Mateo.
- What county is 94401 in?
- 94401 is in San Mateo County.
- What is the population of 94401?
- About 35,295 people (±1,679), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 35,249.
- What is the median household income in 94401?
- $122,227 (±$14,686), compared with $99,122 for California as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 94401?
- 23 USPS carrier routes with 13,804 residential and 1,268 business mailboxes (15,076 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 94401?
- The closest, measured center to center: 94402 (2.5 mi, San Mateo), 94403 (2.7 mi, San Mateo), 94010 (3 mi, Hillsborough), 94404 (3.2 mi, Foster City), 94002 (4.4 mi, Belmont) and 94065 (4.8 mi, Redwood City).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.