ZIP codes in Marin County, California
Marin County has 29 ZIP codes. 28 lie entirely inside it and 1 are shared with neighboring counties, so part of their land and their people are elsewhere. About 258,354 people live in the parts inside it (ACS 2020–2024).
By the All Map Tools Team
- ZIP codes
- 29
- With 1% or more of their land inside
- Entirely inside
- 28
- 99% or more of their land
- Shared with other counties
- 1
- Most with Sonoma County (1)
- Most populated ZIP
- 94901
- 41,307 people · San Rafael
- Least populated ZIP
- 94950
- 22 people
- Largest ZIP by land
- 94952
- 199 sq mi · Bloomfield
Map of the ZIP codes in Marin County
- Entirely in the county (99% or more of its land)
- Shared, mostly in this county
- Neighboring counties
Each area is a ZIP code with its number where it fits. Hover over one to see its name.
All ZIP codes in Marin County
| ZIP code | Main city | Population | Land in the county | Residents in the county |
|---|---|---|---|---|
| 94901 | San Rafael | 41,307 | 100% | 41,307 |
| 94903 | San Rafael | 30,615 | 100% | 30,615 |
| 94904 | Kentfield | 12,815 | 100% | 12,815 |
| 94920 | Tiburon | 12,609 | 99.8% | ≈ 12,585 |
| 94924 | Bolinas | 1,372 | 100% | 1,372 |
| 94925 | Corte Madera | 10,077 | 100% | 10,077 |
| 94929 | Dillon Beach | 293 | 100% | 293 |
| 94930 | Fairfax | 8,406 | 100% | 8,406 |
| 94933 | Lagunitas-Forest Knolls | 1,033 | 100% | 1,033 |
| 94937 | Inverness | 1,009 | 100% | 1,009 |
| 94938 | Lagunitas-Forest Knolls | 437 | 100% | 437 |
| 94939 | Larkspur | 7,315 | 100% | 7,315 |
| 94940 | — | 148 | 100% | 148 |
| 94941 | Mill Valley | 32,706 | 100% | 32,706 |
| 94945 | Novato | 17,635 | 100% | 17,635 |
| 94946 | Nicasio | 715 | 100% | 715 |
| 94947 | Novato | 24,100 | 100% | 24,100 |
| 94949 | Novato | 17,787 | 100% | 17,787 |
| 94950 | — | 22 | 100% | 22 |
| 94952 | Bloomfield | 33,785 | 52% | ≈ 1,317 |
| 94956 | Inverness | 1,080 | 100% | 1,080 |
| 94957 | Ross | 2,321 | 100% | 2,321 |
| 94960 | Sleepy Hollow | 16,232 | 100% | 16,232 |
| 94963 | San Geronimo | 739 | 100% | 739 |
| 94964 | — | 2,344 | 100% | 2,344 |
| 94965 | Sausalito | 11,724 | 100% | 11,724 |
| 94970 | Stinson Beach | 255 | 100% | 255 |
| 94971 | Dillon Beach | 276 | 100% | 276 |
| 94973 | Woodacre | 1,689 | 100% | 1,689 |
ZIP codes shared with other counties
These 1 ZIP codes have part of their land in another county. The first figure is the share of their land in Marin County; then, where the rest lies.
- 94952 (Bloomfield): 52% here; 49% in Sonoma County.
Cities and prefixes
By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Novato (3), Dillon Beach (2), Inverness (2), Lagunitas-Forest Knolls (2), San Rafael (2), and Bloomfield (1); 20 places in all.
All 29 start with the same three digits, 949: the prefix of the USPS sorting center that handles them.
Neighboring counties
Each one with its ZIP codes. Those without a page of their own open in the tool.
Tools for this county
Sources
- U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
- U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
- U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
- U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.
How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.
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