| ZIP Codes: | 41 ZIP Codes (20 Standard, 20 PO Box, 1 Unique) [See All] |
| Area Codes: | 369 / 415 / 628 / 707 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:11:29 PM |
| Population: | 257,061 [See All] |
| FIPS: | 06041 |
| CBSA: | San Francisco-Oakland-Fremont, CA |
| Land Area: | 389 sq mi |
| Water Area: | 36 sq mi |
| Coordinates: | 38.0015, -122.6140 |
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257,061 residents live across 41 ZIPs covering 389 sq mi, served by 26 distinct USPS-recognized cities.
Population moved from 255,972 to 257,061 from 2014 to 2024 — a +0.4% change. 14 ZIPs gained residents, 14 lost.
The county's wealthiest ZIP 94957 (Ross, $250,001 median) and poorest ZIP 94937 (Inverness, $78,281) are 22.0 miles apart — a 3.2× income gap across local geography.
Median home values vary 2.3× across this county — from $862,100 in 94933 (Forest Knolls) to $2,000,001 in 94941 (Mill Valley).
Density varies 415× across the county — from 17 people/sq mi in 94937 (Inverness) to 7,144 in 94964 (San Quentin).
Educational attainment ranges from 7.0% bachelor's+ in 94964 (San Quentin) to 82.6% in 94957 (Ross) — the breadth of educational profiles across the area.
Within California, this is the #26 most populous of 58 counties and ranks #3 for median household income .
On the national stage, Marin County is ranks #16 for income .
Hosts 1 single-entity Unique ZIP: 94998Firemans Fund Ins .
Weighted by population, the typical household earns about $156,951 across the county — reflecting what a typical resident sees, not a simple ZIP average.
61.2% of adults age 25+ hold a bachelor's degree or higher (115,753 of 189,072 reporting).
20 Standard delivery, 20 PO Box only, 1 single-entity Unique ZIPs serve this county.
11 ZIPs in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Median household income spans 3.2× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 94901 | San Rafael | Standard | 41,307 | $115,330 | 13.3 | -1.7% |
| 94941 | Mill Valley | Standard | 32,706 | $209,870 | 26.1 | 6.9% |
| 94903 | San Rafael | Standard | 30,615 | $142,083 | 20.9 | 1.7% |
| 94947 | Novato | Standard | 24,100 | $128,766 | 26.0 | -7.2% |
| 94949 | Novato | Standard | 17,787 | $120,758 | 15.5 | 8.5% |
| 94945 | Novato | Standard | 17,635 | $107,790 | 22.5 | -1.9% |
| 94960 | San Anselmo | Standard | 16,232 | $185,170 | 5.7 | 1.5% |
| 94904 | Greenbrae | Standard | 12,815 | $169,118 | 5.0 | 4.4% |
| 94920 | Belvedere Tiburon | Standard | 12,609 | $246,045 | 6.6 | 0.2% |
| 94965 | Sausalito | Standard | 11,724 | $146,946 | 11.4 | 5.5% |
| 94925 | Corte Madera | Standard | 10,077 | $232,763 | 3.2 | 6.3% |
| 94930 | Fairfax | Standard | 8,406 | $145,362 | 20.2 | -4.0% |
| 94939 | Larkspur | Standard | 7,315 | $203,988 | 2.5 | 5.5% |
| 94964 | San Quentin | PO Box | 2,344 | $115,192 | 0.3 | -47.7% |
| 94957 | Ross | PO Box | 2,321 | $250,001 | 1.5 | 118.3% |
| 94973 | Woodacre | PO Box | 1,689 | $231,094 | 1.6 | -7.8% |
| 94924 | Bolinas | Standard | 1,372 | $101,458 | 30.0 | -4.3% |
| 94956 | Point Reyes Station | Standard | 1,080 | $82,205 | 28.4 | -36.0% |
| 94933 | Forest Knolls | PO Box | 1,033 | $133,006 | 5.2 | -3.4% |
| 94937 | Inverness | Standard | 1,009 | $78,281 | 58.7 | 4.0% |
| 94963 | San Geronimo | PO Box | 739 | $210,823 | 6.2 | 60.3% |
| 94946 | Nicasio | Standard | 715 | $154,688 | 39.8 | 4.8% |
| 94938 | Lagunitas | PO Box | 437 | — | 3.3 | -50.6% |
| 94929 | Dillon Beach | PO Box | 293 | $209,536 | 3.0 | 257.3% |
| 94971 | Tomales | PO Box | 276 | $119,028 | 5.5 | -23.8% |
| 94970 | Stinson Beach | Standard | 255 | $132,857 | 8.9 | -48.5% |
| 94940 | Marshall | Standard | 148 | $47,021 | 6.8 | -23.7% |
| 94950 | Olema | PO Box | 22 | — | 10.8 | -70.3% |
| 94979 | San Anselmo | PO Box | — | — | 0.0 | — |
| 94915 | San Rafael | PO Box | — | — | 0.0 | — |
| 94978 | Fairfax | PO Box | — | — | 0.0 | — |
| 94913 | San Rafael | PO Box | — | — | 0.0 | — |
| 94998 | Novato | Unique | — | — | 0.0 | — |
| 94948 | Novato | PO Box | — | — | 0.0 | — |
| 94976 | Corte Madera | PO Box | — | — | 0.0 | — |
| 94966 | Sausalito | PO Box | — | — | 0.0 | — |
| 94942 | Mill Valley | PO Box | — | — | 0.0 | — |
| 94914 | Kentfield | PO Box | — | — | 0.0 | — |
| 94974 | San Quentin | Standard | — | — | 0.0 | — |
| 94912 | San Rafael | PO Box | — | — | 0.0 | — |
| 94977 | Larkspur | PO Box | — | — | 0.0 | — |