Census tract · Marin County
Census Tract 1242, Marin County, California
Census Tract 1242, GEOID 06041124200, in Marin County, California, mostly within Tiburon (80% of its census blocks). 5,573 residents in the ACS 2020-2024 5-year estimates (±497); the 2020 Census counted 5,873.
Residents, 2020-2024
5,573
±497 (90% margin)
2020 Census count: 5,873
Median household income
$235,161
±$76,527 (90% margin)
Marin County: $149,091
Median home value
$2,000,000 or more
The survey's top or bottom value; no margin is published
Marin County: $1,507,300
Median gross rent
$3,500 or more
The survey's top or bottom value; no margin is published
Marin County: $2,668
Where is Census Tract 1242?
Census Tract 1242 is one of 63 census tracts in Marin County, California. It covers 4.01 square miles of land, 1,466 residents per square mile in 2020. Its GEOID, 06041124200, names it uniquely (how tract numbers and GEOIDs work).
3 census tracts border Census Tract 1242: Tract 1230 ($250,000 or more), Tract 1241 ($245,986) and Tract 179.03 in San Francisco County ($93,269). The figure in brackets is each tract's median household income.
Whether a tract counts as low- or moderate-income for bank lending (the Community Reinvestment Act) is set by the FFIEC against its metro area's family income: look it up in the FFIEC census geocoder.
Source: 2024 Gazetteer and 2020 block assignment files, U.S. Census Bureau · Census reference files
How many people live in Census Tract 1242?
The 2020-2024 American Community Survey puts Census Tract 1242's population at 5,573 (±497) in 2,200 households; the 2020 Census counted 5,873 residents and 2,747 housing units.
| Measure | Tract 1242 | Tiburon |
|---|---|---|
| Total population | 5,573 ±497 | 9,012 |
| Households | 2,200 ±243 | 3,510 |
| Average household size | 2.52 ±0.26 | 2.56 |
| Housing units | 2,611 ±203 | 3,974 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Census Tract 1242?
The median resident of Census Tract 1242 is 54.4 years old; 16.5% are under 18 and 32.6% are 65 or older. The largest group is non-Hispanic white residents at 78.5%, then non-Hispanic Asian residents at 8.2%. 22.5% of residents were born outside the United States.
| Measure | Tract 1242 | Tiburon |
|---|---|---|
| Median age | 54.4 ±2.9 | 51.6 |
| Under 18 years | 16.5% ±3.0 pts | 19.6% |
| 65 years and over | 32.6% ±5.2 pts | 27.5% |
| Hispanic or Latino (any race) | 6.0% ±4.3 pts | 5.8% |
| White alone, not Hispanic | 78.5% ±5.9 pts | 75.8% |
| Black or African American alone, not Hispanic | 0.8% ±1.1 pts | 1.1% |
| Asian alone, not Hispanic | 8.2% ±4.6 pts | 9.5% |
| American Indian and Alaska Native alone, not Hispanic | 0.6% ±0.9 pts | 0.4% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.8 pts | 0.0% |
| Two or more races, not Hispanic | 5.9% ±3.1 pts | 7.5% |
| Some other race alone, not Hispanic | 0.0% ±0.8 pts | 0.0% |
| Born outside the United States | 22.5% ±6.0 pts | 23.2% |
| Speak a language other than English at home (age 5+) | 24.3% ±6.9 pts | 22.6% |
| Civilian veterans (age 18+) | 2.1% ±1.6 pts | 1.6% |
| With a disability | 8.9% ±3.5 pts | 7.1% |
| No health insurance coverage | 1.7% ±2.5 pts | 1.9% |
| High school graduate or higher (age 25+) | 99.9% ±0.3 pts | 98.9% |
| Bachelor's degree or higher (age 25+) | 85.9% ±5.9 pts | 80.1% |
| Graduate or professional degree (age 25+) | 46.6% ±7.2 pts | 44.4% |
| Lived in the same house a year earlier | 90.9% ±4.4 pts | 88.8% |
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 Census Tract 1242 earn?
Half of the 2,200 households in Census Tract 1242 earn less than $235,161 a year (±$76,527), against $149,091 across Marin County: 8th highest of the county's 61 tracts with a reliable estimate.
| Measure | Tract 1242 | Tiburon |
|---|---|---|
| Median household income | $235,161 ±$76,527 | $232,969 |
| Mean household income | $380,530 ±$67,856 | $376,664 |
| Per capita income | $150,830 ±$27,474 | $146,116 |
| People below the poverty line | 1.1% ±1.0 pts | 1.9% |
| Children under 18 below the poverty line | 0.0% ±4.5 pts | 2.1% |
| Households receiving SNAP | 1.7% ±1.9 pts | 4.2% |
| Households with a computer | 100.0% ±1.9 pts | 100.0% |
| Households with a broadband subscription | 99.3% ±1.2 pts | 99.5% |
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 Census Tract 1242?
Owners occupy 77.9% of Census Tract 1242's occupied homes and renters 22.1%. The median owner-occupied home is valued at $2,000,000 or more by its owner (). The median renter pays $3,500 or more a month including utilities, and 36.8% of renters pay 35% or more of their income on rent.
| Measure | Tract 1242 | Tiburon |
|---|---|---|
| Median home value (owner-occupied) | $2,000,000 or more | $2,000,000 or more |
| Median gross rent | $3,500 or more | $3,500 or more |
| Renters paying 35% or more of income on rent | 36.8% ±19.9 pts | 35.1% |
| Median monthly owner costs, with a mortgage | $4,000 or more | $4,000 or more |
| Owner-occupied homes | 77.9% ±7.4 pts | 74.9% |
| Renter-occupied homes | 22.1% ±7.4 pts | 25.1% |
| Housing units | 2,611 ±203 | 3,974 |
| Single-family detached homes | 56.5% ±7.7 pts | 60.0% |
| Mobile homes | 0.0% ±1.6 pts | 0.0% |
| Built 2020 or later | 0.0% ±1.6 pts | 0.4% |
| Built 2010 to 2019 | 2.6% ±3.5 pts | 3.3% |
| Built 1939 or earlier | 8.5% ±4.8 pts | 5.2% |
| Households with no vehicle | 0.0% ±1.9 pts | 1.1% |
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 do people in Census Tract 1242 get to work?
34.2% of Census Tract 1242's workers drive alone and 53.8% work from home. The average trip to work takes 31.3 minutes. The unemployment rate in 2020-2024 averaged 16.9%.
| Measure | Tract 1242 | Tiburon |
|---|---|---|
| In the labor force (age 16+) | 50.7% ±5.7 pts | 57.3% |
| Unemployment rate | 16.9% ±11.1 pts | 10.5% |
| Drove alone to work | 34.2% ±10.7 pts | 42.3% |
| Carpooled | 0.0% ±2.1 pts | 5.3% |
| Public transportation | 4.9% ±3.9 pts | 4.1% |
| Walked | 5.9% ±6.3 pts | 3.7% |
| Worked from home | 53.8% ±11.7 pts | 42.7% |
| Mean travel time to work | 31.3 min ±8.1 | 29.2 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
How does Census Tract 1242 compare with the other tracts in Marin County?
Among Marin County's tracts with a reliable estimate, Census Tract 1242 ranks as shown below (1 = highest).
| Measure | In Marin County |
|---|---|
| Population | 13th of 62 |
| Residents per square mile | 47th of 62 |
| Median household income | 8th of 61 |
| Per capita income | 4th of 62 |
| Median home value | 1st of 61 |
| Median gross rent | 1st of 58 |
| Bachelor's degree or higher | 2nd of 60 |
| Median age | 12th of 62 |
| Owner-occupied share | 18th of 58 |
The tracts next to it on Marin County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 1241 | 5th | $245,986±$28,374 · within the margin of this tract |
| Tract 1191 | 6th | $244,702±$30,018 · within the margin of this tract |
| Tract 1200.02 | 7th | $235,313±$67,749 · within the margin of this tract |
| Tract 1242 | 8th | $235,161±$76,527 |
| Tract 1281 | 9th | $229,813±$29,422 · within the margin of this tract |
| Tract 1261 | 10th | $227,566±$41,189 · within the margin of this tract |
| Tract 1212 | 11th | $216,731±$35,968 · within the margin of this tract |
"Within the margin": the two incomes differ by less than their combined 90% margins, so the survey cannot say which is higher and the ranks between them are not firm.
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · How ranks are computed
How reliable are the figures for Census Tract 1242?
3 of the 18 figures for Census Tract 1242 on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
A census tract's figures rest on a few hundred sampled households over five years, so its margins are wider than a city's. Two tracts differ only when the gap between them is larger than their combined 90% margin (the square root of the sum of the two squared margins). How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · Check it at data.census.gov
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections