94903 ZIP Code, San Rafael, CA
94903 is a ZIP code in San Rafael, California in Marin County. It covers 20 square miles of land. The closest ZIP codes are 94960, 94949 and 94957. 30,615 people live here in 12,013 households. At about 1,540 people per square mile it has suburban density, and owners and renters are mixed (66% own). Median household income is $142,083, above the California median of $99,122; the median age is 49.5, older than most ZIP codes.
Quick facts
- Mailing city: San Rafael, CA
- County: Marin County
- Land area: 20 sq mi
- Population: 30,615
- Median household income: $142,083
- Carrier routes: 27 (12,510 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 30,615 |
| Households | 12,013 |
| Median household income | $142,083 |
| Income per person | $77,317 |
| Median age | 49.5 |
| Homeowners | 65.8% |
| Median home value | $1,197,300 |
| Median rent | $2,993 |
| Bachelor's degree or higher | 55.5% |
| Average commute (minutes) | 27 |
| Households with kids under 18 | 23.1% |
| Moved in the past year | 10.0% |
| Below the poverty line | 6.9% |
| Broadband internet | 95.0% |
| Speak a non-English language at home | 23.7% |
Household income
| % of households | Value |
|---|---|
| <$10K | 4.6% |
| $10–15K | 3.0% |
| $15–25K | 2.7% |
| $25–35K | 4.1% |
| $35–50K | 4.8% |
| $50–75K | 12.9% |
| $75–100K | 7.0% |
| $100–150K | 14.0% |
| $150–200K | 12.9% |
| $200K+ | 33.9% |
Age
| % of all residents | Value |
|---|---|
| <10 | 8.2% |
| 10–19 | 10.8% |
| 20–24 | 4.7% |
| 25–34 | 10.5% |
| 35–44 | 9.7% |
| 45–54 | 14.9% |
| 55–64 | 15.2% |
| 65–74 | 11.6% |
| 75+ | 14.5% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 39.7% |
| Owned outright | 23.0% |
| Rented | 32.2% |
| Vacant | 5.1% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 58.7% |
| Townhome | 6.9% |
| 2–4 units | 3.4% |
| 5–19 units | 10.0% |
| 20+ units | 18.3% |
| Mobile / other | 2.7% |
Businesses in 94903
1,144 business establishments with 15,001 employees (ZIP Codes Business Patterns 2023).
- Health Care and Social Assistance: 224
- Professional, Scientific, and Technical Services: 202
- Construction: 139
- Finance and Insurance: 83
- Other Services (except Public Administration): 80
- Administrative and Support and Waste Management and Remediation Services: 71
- Real Estate and Rental and Leasing: 70
- Retail Trade: 59
EDDM carrier routes
94903 has 27 USPS carrier routes with 12,510 residential and 1,312 business mailboxes. Open the EDDM route map.
Carrier routes in 94903
94903 has 27 USPS carrier routes (27 city (C)) with 12,510 residential and 1,312 business mailboxes. Routes range from 306 homes (C054) to 911 homes (C363); the median route has 409 homes. The Census counted 12,013 households in 94903 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 17 |
| 500–749 | 9 |
| 750–999 | 1 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 94903 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C376 — USPS business mailboxes 316, 534 homes
- Route C374 — USPS business mailboxes 184, 402 homes
- Route C045 — USPS business mailboxes 163, 451 homes
- Route C335 — USPS business mailboxes 162, 559 homes
- Route C340 — USPS business mailboxes 99, 409 homes
Select these 5 routes on the route map
Every carrier route in 94903
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C037 | City | 373 | 5 | $165,749 | — | — | — |
| C038 | City | 329 | 1 | $200,001+ | — | — | — |
| C045 | City | 451 | 163 | $88,550 | — | — | — |
| C047 | City | 331 | 5 | $110,056 | — | — | — |
| C048 | City | 561 | 0 | $123,224 | — | — | — |
| C051 | City | 314 | 16 | $184,020 | — | — | — |
| C052 | City | 383 | 2 | $200,001+ | — | — | — |
| C054 | City | 306 | 74 | $165,749 | — | — | — |
| C056 | City | 448 | 77 | $200,001+ | — | — | — |
| C070 | City | 310 | 2 | $184,020 | — | — | — |
| C071 | City | 596 | 5 | $123,224 | — | — | — |
| C072 | City | 342 | 2 | $149,198 | — | — | — |
| C330 | City | 534 | 4 | $151,560 | — | — | — |
| C331 | City | 503 | 1 | $151,560 | — | — | — |
| C332 | City | 725 | 27 | $77,641 | — | — | — |
| C333 | City | 717 | 37 | $200,001+ | — | — | — |
| C335 | City | 559 | 162 | $136,272 | — | — | — |
| C340 | City | 409 | 99 | $88,550 | — | — | — |
| C341 | City | 356 | 10 | $149,198 | — | — | — |
| C342 | City | 328 | 30 | $102,760 | — | — | — |
| C343 | City | 497 | 11 | $200,001+ | — | — | — |
| C344 | City | 361 | 0 | $165,749 | — | — | — |
| C363 | City | 911 | 52 | $136,272 | — | — | — |
| C374 | City | 402 | 184 | $149,198 | — | — | — |
| C375 | City | 533 | 20 | $149,198 | — | — | — |
| C376 | City | 534 | 316 | $136,272 | — | — | — |
| C377 | City | 397 | 7 | $148,476 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 94903 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
- 94960 — Sleepy Hollow CDP, CA (2 mi)
- 94949 — Novato city, CA (3.9 mi)
- 94957 — Ross town, CA (4.1 mi)
- 94901 — San Rafael city, CA (4.3 mi)
- 94973 — Woodacre CDP, CA (4.4 mi)
- 94930 — Fairfax town, CA (4.7 mi)
- 94904 — Kentfield CDP, CA (5.2 mi)
- 94939 — Larkspur city, CA (5.9 mi)
Areas that include 94903
- San Rafael, CA ZIP codes — 2 ZIP codes
- Lucas Valley-Marinwood, CA ZIP codes — 1 ZIP code
- Santa Venetia, CA ZIP codes — 2 ZIP codes
- Marin County ZIP codes — 29 ZIP codes
- California ZIP code data
Mail every home in 94903
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) 94903, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 94903 in?
- 94903 is a San Rafael, CA mailing address. By land area, 32% lies inside San Rafael, 29% lies inside Lucas Valley-Marinwood and 11% lies inside Santa Venetia; the rest is outside any Census-defined city or community.
- What county is 94903 in?
- 94903 is in Marin County.
- What is the population of 94903?
- About 30,615 people (±1,536), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 30,514.
- What is the median household income in 94903?
- $142,083 (±$17,444), 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 94903?
- 27 USPS carrier routes with 12,510 residential and 1,312 business mailboxes (13,822 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 94903?
- The closest, measured center to center: 94960 (2 mi, Sleepy Hollow), 94949 (3.9 mi, Novato), 94957 (4.1 mi, Ross), 94901 (4.3 mi, San Rafael), 94973 (4.4 mi, Woodacre) and 94930 (4.7 mi, Fairfax).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.