94404 ZIP Code, San Mateo, CA
94404 is a ZIP code in San Mateo, California in San Mateo County. It covers 4.3 square miles of land. The closest ZIP codes are 94065, 94403 and 94401. 35,881 people live here in 14,717 households. At about 8,249 people per square mile it is built up to city-neighborhood density, and owners and renters are mixed (51% own). Median household income is $192,332, well above the California median of $99,122.
Quick facts
- Mailing city: San Mateo, CA
- County: San Mateo County
- Land area: 4.3 sq mi
- Population: 35,881
- Median household income: $192,332
- Carrier routes: 26 (15,551 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 35,881 |
| Households | 14,717 |
| Median household income | $192,332 |
| Income per person | $99,796 |
| Median age | 39.8 |
| Homeowners | 51.2% |
| Median home value | $1,714,400 |
| Median rent | $3,501 |
| Bachelor's degree or higher | 74.3% |
| Average commute (minutes) | 29 |
| Households with kids under 18 | 32.6% |
| Moved in the past year | 17.8% |
| Below the poverty line | 4.3% |
| Broadband internet | 97.8% |
| Speak a non-English language at home | 53.2% |
Household income
| % of households | Value |
|---|---|
| <$10K | 1.7% |
| $10–15K | 1.9% |
| $15–25K | 2.2% |
| $25–35K | 1.9% |
| $35–50K | 4.7% |
| $50–75K | 7.0% |
| $75–100K | 6.3% |
| $100–150K | 14.1% |
| $150–200K | 11.8% |
| $200K+ | 48.4% |
Age
| % of all residents | Value |
|---|---|
| <10 | 12.3% |
| 10–19 | 10.2% |
| 20–24 | 3.5% |
| 25–34 | 14.4% |
| 35–44 | 18.1% |
| 45–54 | 12.4% |
| 55–64 | 11.3% |
| 65–74 | 7.6% |
| 75+ | 10.2% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 33.0% |
| Owned outright | 16.3% |
| Rented | 46.6% |
| Vacant | 4.1% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 31.4% |
| Townhome | 20.8% |
| 2–4 units | 7.3% |
| 5–19 units | 12.7% |
| 20+ units | 27.6% |
| Mobile / other | 0.2% |
Businesses in 94404
911 business establishments with 26,284 employees (ZIP Codes Business Patterns 2023).
- Professional, Scientific, and Technical Services: 193
- Health Care and Social Assistance: 119
- Accommodation and Food Services: 92
- Real Estate and Rental and Leasing: 87
- Finance and Insurance: 78
- Other Services (except Public Administration): 54
- Information: 53
- Wholesale Trade: 43
EDDM carrier routes
94404 has 26 USPS carrier routes with 15,551 residential and 582 business mailboxes. Open the EDDM route map.
Carrier routes in 94404
94404 has 26 USPS carrier routes (26 city (C)) with 15,551 residential and 582 business mailboxes. Routes range from 353 homes (C006) to 993 homes (C002); the median route has 592 homes. The Census counted 14,717 households in 94404 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 6 |
| 500–749 | 17 |
| 750–999 | 3 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 94404 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C034 — USPS business mailboxes 121, 593 homes
- Route C031 — USPS business mailboxes 91, 394 homes
- Route C005 — USPS business mailboxes 74, 653 homes
- Route C030 — USPS business mailboxes 68, 805 homes
- Route C002 — USPS business mailboxes 55, 993 homes
Select these 5 routes on the route map
Every carrier route in 94404
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 806 | 4 | $198,397 | — | — | — |
| C002 | City | 993 | 55 | $198,397 | — | — | — |
| C003 | City | 508 | 20 | $165,707 | — | — | — |
| C005 | City | 653 | 74 | $121,989 | — | — | — |
| C006 | City | 353 | 2 | $166,760 | — | — | — |
| C008 | City | 513 | 0 | $175,278 | — | — | — |
| C009 | City | 684 | 2 | $200,001+ | — | — | — |
| C010 | City | 642 | 1 | $200,001+ | — | — | — |
| C014 | City | 516 | 50 | $200,001+ | — | — | — |
| C016 | City | 675 | 4 | $200,001+ | — | — | — |
| C020 | City | 581 | 1 | $200,001+ | — | — | — |
| C023 | City | 609 | 0 | $200,001+ | — | — | — |
| C024 | City | 639 | 1 | $175,278 | — | — | — |
| C027 | City | 581 | 2 | $122,755 | — | — | — |
| C028 | City | 590 | 2 | $192,470 | — | — | — |
| C029 | City | 729 | 22 | $126,122 | — | — | — |
| C030 | City | 805 | 68 | $200,001+ | — | — | — |
| C031 | City | 394 | 91 | $121,989 | — | — | — |
| C032 | City | 719 | 27 | $139,235 | — | — | — |
| C033 | City | 457 | 0 | $200,001+ | — | — | — |
| C034 | City | 593 | 121 | $200,001+ | — | — | — |
| C036 | City | 422 | 4 | $200,001+ | — | — | — |
| C037 | City | 694 | 1 | $200,001+ | — | — | — |
| C042 | City | 468 | 30 | $200,001+ | — | — | — |
| C052 | City | 534 | 0 | $165,460 | — | — | — |
| C053 | City | 393 | 0 | $200,001+ | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 94404 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
- 94065 — Redwood City city, CA (1.8 mi)
- 94403 — San Mateo city, CA (2.4 mi)
- 94401 — San Mateo city, CA (3.2 mi)
- 94002 — Belmont city, CA (3.3 mi)
- 94402 — San Mateo city, CA (3.6 mi)
- 94070 — San Carlos city, CA (4.1 mi)
- 94063 — Redwood City city, CA (5.9 mi)
- 94010 — Hillsborough town, CA (6 mi)
Areas that include 94404
- San Mateo, CA ZIP codes — 4 ZIP codes
- Foster City, CA ZIP codes — 1 ZIP code
- San Mateo County ZIP codes — 31 ZIP codes
- California ZIP code data
Where it ranks
- No. 8 of 28: highest share of households with children in San Mateo County
- No. 2 of 28: highest share of residents who moved in during the past year in San Mateo County
- No. 8 of 28: lowest median age in San Mateo County
Mail every home in 94404
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) 94404, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 94404 in?
- 94404 is a San Mateo, CA mailing address. By land area, 87% lies inside Foster City and 13% lies inside San Mateo.
- What county is 94404 in?
- 94404 is in San Mateo County.
- What is the population of 94404?
- About 35,881 people (±326), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 37,323.
- What is the median household income in 94404?
- $192,332 (±$12,368), 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 94404?
- 26 USPS carrier routes with 15,551 residential and 582 business mailboxes (16,134 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 94404?
- The closest, measured center to center: 94065 (1.8 mi, Redwood City), 94403 (2.4 mi, San Mateo), 94401 (3.2 mi, San Mateo), 94002 (3.3 mi, Belmont), 94402 (3.6 mi, San Mateo) and 94070 (4.1 mi, San Carlos).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.