What is the largest city in Marin County, CA?

San Rafael is the largest city or town in Marin County, with about 60,433 residents.

How many ZIP codes are in Marin County?

Marin County includes 28 ZIP Code Tabulation Areas, including 94901, 94903, 94904, 94920, 94924.

What is the population of Marin County, CA?

About 257,969 people live in Marin County, based on American Community Survey 5-year estimates.

What counties border Marin County?

Marin County borders San Francisco County, Sonoma County.

Marin County, CA: Cities, ZIP Codes & Local Data

Population

257,969

Land area

520sq mi

People per sq mi

496

ZIP codes

28

Marin County at a glance

Marin County is 97% denser than California as a whole.
Households here earn a median of $149,091 a year, 50% more than the California figure of $99,122.
A typical owner-occupied home is valued at $1,507,300 (about 2.1 times the California figure) and median rent is $2,668 a month.
The biggest population centers are San Rafael (60,433), Novato (52,546) and Mill Valley (14,012).

Local data for Marin County, CA

Counts from official public data

Housing and community stats

Marin County, CA, American Community Survey 2020-2024

Full profile

Median household income

$149,091

Poverty rate

8.3%

Median home value

$1,507,300

Prices -0.8% in a year

Median rent

$2,668/mo

Homeownership

64.7%

Bachelor's or higher

61.1%

Median age

47.4

Average commute

27.4 min

Largest reported origins and ancestries: German Americans (34,303), Irish Americans (34,173), Mexican Americans (20,271).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

4.4%

Aug 2026, -0.2 pts in a year

Average annual pay

$94,975

110,071 jobs, 2025

Income per person

$190,891

BEA, 2024

Federal spending

$1.97B

FY 2026, $7,499 per person

PPP loans

$1.2B

13,987 loans, 109,690 jobs reported

Campaign donations

$17.69M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Marin County, CA, workers 16 and older. American Community Survey 5-year estimates

Drove alone51.8%
Carpooled7.1%
Public transit3.6%
Walked3.5%
Bicycle1.2%
Taxi, ride-hailing, motorcycle or other1.3%
Worked from home31.5%

Average one-way commute: 27.4 minutes for people who do not work from home.

Environment and hazard risk

Marin County, CA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: landslide

Storm events since 1996

549

Most often strong wind

Flood insurance policies

4,542

5.4% of homes, county

July high / Jan low

81° / 43°F

34.5 inches of rain a year

Hazards, floods and storm history Check a flood zone 26 historic places

Health statistics

Share of adults in Marin County, CA, CDC PLACES estimates

All 40 measures

Obesity

21.3%

U.S. 33.3% -12.0 pts

Diabetes

10.2%

U.S. 12.1% -1.9 pts

Smoking

8.2%

U.S. 12.8% -4.6 pts

Uninsured (18-64)

5.5%

U.S. 11.1% -5.6 pts

Cities, towns and ZIP codes in Marin County

Population shown

Frequently asked questions

What is the largest city in Marin County, CA?: San Rafael is the largest city or town in Marin County, with about 60,433 residents.
How many ZIP codes are in Marin County?: Marin County includes 28 ZIP Code Tabulation Areas, including 94901, 94903, 94904, 94920, 94924.
What is the population of Marin County, CA?: About 257,969 people live in Marin County, based on American Community Survey 5-year estimates.
What counties border Marin County?: Marin County borders San Francisco County, Sonoma County.