County · California

Marin County, California

Marin County, California. Marin County had 253,694 residents in 2025 by the Census Bureau's estimate, down 3.3% since 2020, a steeper fall than California's (−0.5%). It holds 31 places (11 cities, villages and boroughs and 20 census-designated) and 63 census tracts. GEOID 06041.

Marin County is one of the 5 counties of the San Francisco-Oakland-Fremont, CA metropolitan statistical area (the Census Bureau's July 2023 delineation).

Residents, July 2025 estimate

253,694

Census Bureau estimate (no margin published)
2020 Census count: 262,321 · ACS 2020-2024: 257,969

Median household income

$149,091

±$4,474 (90% margin)
California: $99,122

Median home value

$1,507,300

±$27,346 (90% margin)
California: $734,700

Median gross rent

$2,668

±$83 (90% margin)
California: $2,036

How many people live in Marin County, and is it growing?

The 2020 Census counted 262,321 residents in Marin County. The Census Bureau estimates 253,694 for July 1, 2025, down 3.3% since 2020, a steeper fall than California's (−0.5%). The 2020-2024 American Community Survey puts the population at 257,969 over 520 square miles of land.

July 2020→2021 −1,988 (259,349)
2021→2022 −2,311 (257,038)
2022→2023 −1,595 (255,443)
2023→2024 +261 (255,704)
2024→2025 −2,010 (253,694)

Marin County in California. Boundaries: Census Bureau 2024.

Counts, ACS 2020-2024 5-year estimates, with the change from 2015-2019
Measure	Marin County	California	Change since 2015-2019
Total population	257,969	39,287,377	−1,974
Households	103,018±725	13,548,091	−2,414
Average household size	2.44±0.02	2.84	+0.04
Housing units	112,116±118	14,644,735	−968

Marin County's population since 2000

From 247,289 in 2000 to 253,694 in 2025: up 2.6%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.

2000 Census 247,289
2005 (estimate) 244,206
2010 Census 252,409
2015 (estimate) 260,974
2020 Census 262,321
2025 (estimate) 253,694

Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov

What cities and towns are in Marin County?

Marin County holds 31 places: 11 cities, villages and boroughs (incorporated places) and 20 census-designated places. The largest is San Rafael with 59,410 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.

Places in Marin County, ACS 2020-2024 5-year estimates. Ring: estimate with a coefficient of variation over 40%.

San Rafael	city	61,271	60,433±83	$119,435	$1,355,600	11.7%	100%
Novato	city	53,225	52,546±71	$115,736	$1,032,500	9.6%	100%
Mill Valley	city	14,231	14,012±26	$206,212	$2,000,000 or more	5.9%	100%
Larkspur	city	13,064	12,854±26	$140,417	$1,996,600	7.0%	100%
San Anselmo	town	12,830	12,679±37	$173,641	$1,576,700	7.4%	100%
Tamalpais-Homestead Valley	CDP	11,492	12,085±1,077	$243,227	$1,863,900	3.3%	100%
Corte Madera	town	10,222	10,077±20	$232,763	$1,755,200	4.6%	100%
Tiburon	town	9,146	9,012±30	$232,969	$2,000,000 or more	1.9%	100%
Fairfax, Marin County	town	7,605	7,516±22	$141,653	$1,163,600	12.1%	100%
Sausalito	city	7,269	7,141±37	$182,357	$1,894,600	8.0%	100%
Kentfield	CDP	6,808	6,900±630	$249,896	$2,000,000 or more	3.9%	100%
Lucas Valley-Marinwood	CDP	6,259	6,473±654	$200,761	$1,445,600	4.2%	100%
Strawberry (Marin County)	CDP	5,447	5,830±772	$157,661	$2,000,000 or more	7.0%	100%
Santa Venetia	CDP	4,289	3,725±620	$126,833	$1,006,300	7.8%	100%
Marin City	CDP	2,993	3,195±432	$68,846	$1,142,700	16.1%	100%
Sleepy HollowGEOID 0672184	CDP	2,401	3,063±547	$250,000 or more	$2,000,000 or more	1.0%	100%
Ross	town	2,338	2,606±355	$250,000 or more	$2,000,000 or more	4.8%	100%
Belvedere	city	2,126	2,345±329	$250,000 or more	$2,000,000 or more	5.9%	100%
Lagunitas-Forest KnollsGEOID 0639283	CDP	1,924	1,626±441	$130,682	$939,500	4.4%	100%
Bolinas	CDP	1,483	1,334±286	$100,625	$2,000,000 or more	9.1%	100%
Black Point-Green Point	CDP	1,431	1,655±380	$168,438	$1,701,200	9.8%	100%
WoodacreGEOID 0686216	CDP	1,410	1,627±545	$231,953	$1,071,800	9.0%	100%
Inverness	CDP	1,379	1,346±280	$80,176	$1,872,700	4.8%	100%
Point Reyes StationGEOID 0657960	CDP	895	517±220	$112,813	$1,603,200	3.7%	100%
AltoGEOID 0601416	CDP	732	1,024±346	$129,191	not published	26.0%	100%
Stinson BeachGEOID 0674172	CDP	541	255±110	$132,857	$1,493,400	14.5%	100%
San GeronimoGEOID 0667070	CDP	510	583±299	$171,932	$1,175,500	0.0%	100%
Muir BeachGEOID 0649950	CDP	304	311±83	$140,227	$2,000,000 or more	8.0%	100%
Dillon BeachGEOID 0619262	CDP	246	293±176	$209,536	$1,660,000	0.0%	100%
TomalesGEOID 0678890	CDP	187	168±149	not published	$849,400	54.8%	100%
NicasioGEOID 0651280	CDP	81	91±45	$250,000 or more	$1,968,800	0.0%	100%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov

Who lives in Marin County?

The median resident of Marin County is 47.4 years old; 19.4% are under 18 and 23.8% are 65 or older. The largest group is non-Hispanic white residents at 65.1%, then Hispanic or Latino residents (of any race) at 19.5%. 19.6% of residents were born outside the United States.

Age, origin and education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
Measure	Marin County	California	Change since 2015-2019
Median age	47.4±0.3	37.9	+0.6
Under 18 years	19.4%±0.1 pts	22.0%	–
65 years and over	23.8%±0.1 pts	15.7%	–
Hispanic or Latino (any race)	19.5%	40.2%	+3.5 pts
White alone, not Hispanic	65.1%±0.4 pts	33.8%	−6.1 pts
Black or African American alone, not Hispanic	2.1%±0.2 pts	5.2%	no clear change
Asian alone, not Hispanic	6.1%±0.3 pts	15.3%	no clear change
American Indian and Alaska Native alone, not Hispanic	0.1%±0.1 pts	0.3%	–
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0.2%±0.1 pts	0.3%	–
Two or more races, not Hispanic	5.9%±0.4 pts	4.4%	–
Some other race alone, not Hispanic	1.2%±0.3 pts	0.6%	–
Born outside the United States	19.6%±0.7 pts	27.0%	+1.5 pts
Speak a language other than English at home (age 5+)	23.9%±0.8 pts	44.4%	–
Civilian veterans (age 18+)	3.8%±0.3 pts	4.3%	–
With a disability	10.0%±0.5 pts	11.6%	–
No health insurance coverage	3.8%±0.4 pts	6.6%	no clear change
High school graduate or higher (age 25+)	92.8%±0.6 pts	84.7%	–
Bachelor's degree or higher (age 25+)	61.1%±0.9 pts	37.1%	+1.6 pts
Graduate or professional degree (age 25+)	27.6%±0.8 pts	14.4%	–
Moved from another state in the past year	1.2%±0.3 pts	1.1%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov

What do households in Marin County earn?

Half of Marin County's 103,018 households earn less than $149,091 a year (±$4,474), against $99,122 in California. In 2015-2019 the median was $141,833 in 2024 dollars, so it rose by $7,258 after inflation. 8.3% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
Measure	Marin County	California	Change since 2015-2019
Median household income	$149,091±$4,474	$99,122	+$7,258
Mean household income	$232,566±$6,176	$140,436	–
Per capita income	$93,920±$2,414	$49,513	+$4,737
People below the poverty line	8.3%±0.7 pts	12.0%	+1.1 pts
Children under 18 below the poverty line	9.8%±1.6 pts	15.0%	no clear change
Households receiving SNAP	5.5%±0.6 pts	12.4%	–
Households with a broadband subscription	95.8%±0.6 pts	93.5%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What does housing cost in Marin County?

Owners occupy 64.7% of Marin County's occupied homes and renters 35.3%. The median owner-occupied home is valued at $1,507,300 by its owner (±$27,346). The median renter pays $2,668 a month including utilities, and 47.2% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
Measure	Marin County	California	Change since 2015-2019
Median home value (owner-occupied)	$1,507,300±$27,346	$734,700	+$281,775
Median gross rent	$2,668±$83	$2,036	+$122
Renters paying 35% or more of income on rent	47.2%±2.2 pts	46.0%	+5.0 pts
Median monthly owner costs, with a mortgage	$4,000 or more	$2,946	–
Owner-occupied homes	64.7%±1.1 pts	55.9%	no clear change
Housing units	112,116±118	14,644,735	−968
Homeowner vacancy rate	0.8%±0.4 pts	0.8%	–
Rental vacancy rate	3.8%±1.0 pts	4.2%	–
Single-family detached homes	63.2%±1.0 pts	57.0%	–
Mobile homes	1.3%±0.3 pts	3.5%	–
Built 2020 or later	0.3%±0.1 pts	1.3%	–
Built 1939 or earlier	12.6%±0.6 pts	8.9%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov

How many new homes is Marin County building?

Builders took permits for 149 new housing units across Marin County in 2025 (149 single-family), 0.6 per 1,000 residents.

2019 240 units
2020 155 units
2021 265 units
2022 302 units
2023 304 units
2024 158 units
2025 149 units

Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey

How do people in Marin County get to work?

51.8% of Marin County's workers drive alone and 31.5% work from home. The average trip to work takes 27.4 minutes. The unemployment rate in 2020-2024 averaged 6.1%.

Work and commuting, ACS 2020-2024 5-year estimates
Measure	Marin County	California	Change since 2015-2019
In the labor force (age 16+)	62.3%±0.7 pts	63.8%	–
Unemployment rate	6.1%±0.6 pts	6.6%	+2.4 pts
Drove alone to work	51.8%±1.4 pts	65.7%	–
Carpooled	7.1%±0.7 pts	9.5%	–
Public transportation	3.6%±0.5 pts	2.9%	–
Walked	3.5%±0.5 pts	2.4%	–
Worked from home	31.5%±1.1 pts	17.2%	+19.1 pts
Mean travel time to work	27.4 min±0.7	28.7 min	−5.2 min

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What are Marin County's census tracts?

Marin County is divided into 63 census tracts. Among those with a reliable estimate, median household income runs from $58,901 (Tract 1290) to $250,000 or more (Tract 1282).

All 63 census tracts of Marin County, with their figures

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

How does Marin County compare with California's other counties?

Marin County's rank among California's counties with a reliable estimate (1 = highest)
Measure	Rank
Population	26th of 58
Growth 2020-2025	44th of 58
Residents per square mile	13th of 58
Median household income	3rd of 58
Median home value	2nd of 58
Median gross rent	3rd of 56
Poverty rate	51st of 57
Bachelor's degree or higher	1st of 58
Median age	10th of 58

Every county in California

Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections

Not on this page: crime, weather and schools for Marin County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.