Data Last Updated: May 1, 2025

Marin County, CA ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Marin, CA.	42 ZIP Codes (20 General, 20 PO Box, 1 Unique, & 1 Multi County) [More Details]
Area Codes: The Telephone Area Codes that are associated with Marin, CA. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	369, 707, 415, 628
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Pacific
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Marin, CA from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	262,321 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	06041
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	San Francisco-Oakland-Fremont, CA
Land Area: The approximate amount of land area covered by Marin, CA in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	520 square miles
Water Area: The approximate amount of water area covered by Marin, CA in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	308 square miles
Coordinates: The latitude/longitude centroid coordinates for Marin County, CA.	-122.723382, 38.073375
Quick Link: Copy the direct link to the Marin, CACounty page and use anywhere you like!	https://www.zip-codes.com/county/ca-marin.asp

Marin, CA ZIP Code Boundaries

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Marin County, CA Covers 42 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 94901	General	San Rafael	43,338	16.52%
ZIP Code 94903	General	San Rafael	30,514	11.63%
ZIP Code 94904	General	Greenbrae	12,718	4.85%
ZIP Code 94912	P.O. Box	San Rafael	0	0.00%
ZIP Code 94913	P.O. Box	San Rafael	0	0.00%
ZIP Code 94914	P.O. Box	Kentfield	0	0.00%
ZIP Code 94915	P.O. Box	San Rafael	0	0.00%
ZIP Code 94920	General	Belvedere Tiburon	13,010	4.96%
ZIP Code 94924	General	Bolinas	1,507	0.57%
ZIP Code 94925	General	Corte Madera	10,204	3.89%
ZIP Code 94929	P.O. Box	Dillon Beach	227	0.09%
ZIP Code 94930	General	Fairfax	8,729	3.33%
ZIP Code 94933	P.O. Box	Forest Knolls	1,226	0.47%
ZIP Code 94937	General	Inverness	935	0.36%
ZIP Code 94938	P.O. Box	Lagunitas	683	0.26%
ZIP Code 94939	General	Larkspur	7,465	2.85%
ZIP Code 94940	General	Marshall	319	0.12%
ZIP Code 94941	General	Mill Valley	31,480	12.00%
ZIP Code 94942	P.O. Box	Mill Valley	0	0.00%
ZIP Code 94945	General	Novato	17,876	6.81%
ZIP Code 94946	General	Nicasio	624	0.24%
ZIP Code 94947	General	Novato	24,870	9.48%
ZIP Code 94948	P.O. Box	Novato	0	0.00%
ZIP Code 94949	General	Novato	17,588	6.70%
ZIP Code 94950	P.O. Box	Olema	60	0.02%
ZIP Code 94952 *	General	Petaluma	33,619	--
ZIP Code 94956	General	Point Reyes Station	1,684	0.64%
ZIP Code 94957	P.O. Box	Ross	1,858	0.71%
ZIP Code 94960	General	San Anselmo	15,920	6.07%
ZIP Code 94963	P.O. Box	San Geronimo	506	0.19%
ZIP Code 94964	P.O. Box	San Quentin	4,264	1.63%
ZIP Code 94965	General	Sausalito	11,447	4.36%
ZIP Code 94966	P.O. Box	Sausalito	0	0.00%
ZIP Code 94970	General	Stinson Beach	620	0.24%
ZIP Code 94971	P.O. Box	Tomales	372	0.14%
ZIP Code 94973	P.O. Box	Woodacre	1,516	0.58%
ZIP Code 94974	General	San Quentin	0	0.00%
ZIP Code 94976	P.O. Box	Corte Madera	0	0.00%
ZIP Code 94977	P.O. Box	Larkspur	0	0.00%
ZIP Code 94978	P.O. Box	Fairfax	0	0.00%
ZIP Code 94979	P.O. Box	San Anselmo	0	0.00%

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Marin, CA, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Marin, CA Information

Marin County, CA Covers 42 ZIP Codes. This includes 20 General ZIP Codes, 20 PO Box ZIP Codes, and 1 Unique (reserved for Business and Volume Mail Receivers). There is also 1 Multi County ZIP Code in this area. This record is assigned to a different county, but it does partially cover area in Marin County.

The population for Marin County is 262,321, according to the U.S. Census. Population Density is 504.46 persons per square mile. With 111,564 Housing Units, the Average Household Size is 2.44 persons. There are 104,167 Family Households with an Average Family Size of 2.87 persons. 3.26% of the population is without Health Insurance. The 58.87% Employment Rate is 0.93% above the national average of 59.8%.189,953 people aged 25+ have some educational achievement, with 60.46% (or 114,844 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

There are 4 area codes serving this area including369, 707, 415 and 628. Marin is also located in the Pacific timezone and the current local time is shown above.

Marin is part of the San Francisco-Oakland-Fremont, CA Core Based Statistical Area (CBSA). Its CBSA Code is 41860.It is classified as a metro area, which means the combined population is 50,000 or more (at its core).

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more (for a micro area) and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Marin, CA have 101,321 Residential mailboxes and 10,416 Business mailboxes.There are 10,072 businesses with a total of 103,481 employees. That is an average of 10.3 employees per business. Annual payroll for these businesses is $9,076,412,000. Other Demographics

Marin County Demographic Profile

Population & People

Total Population

262,321

Income

Median Household Income

$142,785

Housing

Total Housing Units

111,564

Health

Without Healthcare Coverage

3.26%

Business & Economy

Total Businesses

10,072

Families

Total Households

104,167

Employment

Employment Rate

58.87%

Education

Bachelor's Degree or Higher

60.46%

Total Population: Total number of people from the 2020 U.S. Census for Marin, CA. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	262,321
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Marin, CA. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	248,067
Total Households: Total number of Households from the 2020 U.S. Census for Marin, CA. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	104,167
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	111,564
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.44
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.87

Other Marin Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	101,321
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	10,416
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	140,712
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	69,856
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	21,760

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	10,072
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$2,274,776,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$9,076,412,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	103,481

Sum of all ZIP Codes assigned Marin, CA as their primary County.

References

U.S. Postal Service [Last Updated: 5/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 5/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov