County ZIP codes · California · FIPS 06041
Marin County, CA ZIP Codes
Marin County, California has 42 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 29 residential and 13 for PO boxes or a single organization. 1 of the residential ones extends into a neighboring county. Median household income ranges from $107,790 in 94945 (Novato) to $250,000 or more in 94957 (Ross) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Marin County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $120,758 and $169,118. One reports $250,000 or more, the Census top code.
They carry 26 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 29 residential ZIP codes in Marin County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 94901 | San Rafael | 41,307 | 3,153 | $115k | $1.51M | 100% |
| 94952 | Petaluma | 33,785 | 170 | $117k | $1.04M | 52% |
| 94941 | Mill Valley | 32,706 | 867 | $210k | $2M+ | 100% |
| 94903 | San Rafael | 30,615 | 1,540 | $142k | $1.2M | 100% |
| 94947 | Novato | 24,100 | 1,099 | $129k | $1.02M | 100% |
| 94949 | Novato | 17,787 | 1,328 | $121k | $1.15M | 100% |
| 94945 | Novato | 17,635 | 765 | $108k | $1.12M | 100% |
| 94960 | San Anselmo | 16,232 | 2,761 | $185k | $1.67M | 100% |
| 94904 | Greenbrae | 12,815 | 2,590 | $169k | $2M+ | 100% |
| 94920 | Belvedere Tiburon | 12,609 | 1,937 | $246k | $2M+ | 100% |
| 94965 | Sausalito | 11,724 | 804 | $147k | $1.54M | 100% |
| 94925 | Corte Madera | 10,077 | 3,138 | $233k | $1.76M | 100% |
| 94930 | Fairfax | 8,406 | 590 | $145k | $1.17M | 100% |
| 94939 | Larkspur | 7,315 | 3,100 | $204k | $2M+ | 100% |
| 94964 | San Quentin | 2,344 | 5,140 | $115k | – | 100% |
| 94957 | Ross | 2,321 | 1,635 | $250k+ | $2M+ | 100% |
| 94973 | Woodacre | 1,689 | 427 | $231k | $1.08M | 100% |
| 94924 | Bolinas | 1,372 | 50 | $102k | $2M+ | 100% |
| 94956 | Point Reyes Station | 1,080 | 31 | $82k | $1.68M | 100% |
| 94933 | Forest Knolls | 1,033 | 322 | $133k | $862k | 100% |
| 94937 | Inverness | 1,009 | 18 | $78k | $1.79M | 100% |
| 94963 | San Geronimo | 739 | 463 | $211k | $1.16M | 100% |
| 94946 | Nicasio | 715 | 19 | $155k | $2M+ | 100% |
| 94938 | Lagunitas | 437 | 46 | – | $1.15M | 100% |
| 94929 | Dillon Beach | 293 | 310 | $210k | $1.66M | 100% |
| 94971 | Tomales | 276 | 12 | $119k | $884k | 100% |
| 94970 | Stinson Beach | 255 | 35 | $133k | $1.49M | 100% |
| 94940 | Marshall | 148 | 6 | $47k | $2M+ | 100% |
| 94950 | Olema | 22 | 5 | – | – | 100% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
1 ZIP code of Marin County extends into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Marin | Elsewhere |
|---|---|---|
| 94952 | 52% | Sonoma County 49% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Marin County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Marin County starts with 949.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 949 | North Bay, CA (SCF 949) | 42 | 55 |
42 of the 55 ZIP codes that start with 949 are Marin County's, all sorted at North Bay, CA (SCF 949). The other 13 are 94922 (Bodega), 94923 (Bodega Bay), 94926 (Rohnert Park, PO Box or unique), 94927 (Rohnert Park, PO Box or unique), 94928 (Rohnert Park), 94931 (Cotati), 94951 (Penngrove), 94953 (Petaluma, PO Box or unique), 94954 (Petaluma), 94955 (Petaluma, PO Box or unique), 94972 (Valley Ford), 94975 (Petaluma, PO Box or unique), 94999 (Petaluma, PO Box or unique).
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.