Census tract · Tuolumne County
Census Tract 31.01, Tuolumne County, California
Census Tract 31.01, GEOID 06109003101, in Tuolumne County, California, mostly within Twain Harte (61% of its census blocks). 2,406 residents in the ACS 2020-2024 5-year estimates (±416); the 2020 Census counted 2,455.
Residents, 2020-2024
2,406
±416 (90% margin)
2020 Census count: 2,455
Median household income
$105,180
±$26,756 (90% margin)
Tuolumne County: $77,404
Median home value
$468,900
±$43,562 (90% margin)
Tuolumne County: $433,200
Median gross rent
$2,037
±$511 (90% margin)
Tuolumne County: $1,302
Where is Census Tract 31.01?
Census Tract 31.01 is one of 18 census tracts in Tuolumne County, California. It covers 4.46 square miles of land, 550 residents per square mile in 2020. Its GEOID, 06109003101, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| Twain Harte | 61% |
| Cedar Ridge | 8% |
| Mono Vista | 2% |
5 census tracts border Census Tract 31.01: Tract 21.02 ($61,667), Tract 22.01 ($77,474), Tract 22.02 ($109,213), Tract 31.02 ($88,584) and Tract 32 ($80,000). 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 31.01?
The 2020-2024 American Community Survey puts Census Tract 31.01's population at 2,406 (±416) in 963 households; the 2020 Census counted 2,455 residents and 2,052 housing units.
| Measure | Tract 31.01 | Twain Harte |
|---|---|---|
| Total population | 2,406 ±416 | 2,372 |
| Households | 963 ±152 | 1,049 |
| Average household size | 2.48 ±0.34 | 2.26 |
| Housing units | 2,104 ±212 | 2,260 |
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 31.01?
The median resident of Census Tract 31.01 is 51.5 years old; 16.0% are under 18 and 28.4% are 65 or older. The largest group is non-Hispanic white residents at 81.7%, then Hispanic or Latino residents (of any race) at 11.4%.
| Measure | Tract 31.01 | Twain Harte |
|---|---|---|
| Median age | 51.5 ±9.4 | 47.0 |
| Under 18 years | 16.0% ±4.7 pts | 16.7% |
| 65 years and over | 28.4% ±7.9 pts | 24.4% |
| Hispanic or Latino (any race) | 11.4% ±8.8 pts | 7.0% |
| White alone, not Hispanic | 81.7% ±10.3 pts | 91.2% |
| Black or African American alone, not Hispanic | 0.2% ±0.4 pts | 0.0% |
| Asian alone, not Hispanic | 0.4% ±0.6 pts | 0.6% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±1.7 pts | 0.0% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±1.7 pts | 0.0% |
| Two or more races, not Hispanic | 6.3% ±3.6 pts | 1.3% |
| Some other race alone, not Hispanic | 0.0% ±1.7 pts | 0.0% |
| Born outside the United States | 7.5% ±5.6 pts | 8.7% |
| Speak a language other than English at home (age 5+) | 9.4% ±5.4 pts | 9.2% |
| Civilian veterans (age 18+) | 14.6% ±6.3 pts | 15.2% |
| With a disability | 23.6% ±10.8 pts | 24.7% |
| No health insurance coverage | 6.1% ±5.6 pts | 6.8% |
| High school graduate or higher (age 25+) | 95.1% ±5.0 pts | 93.1% |
| Bachelor's degree or higher (age 25+) | 40.6% ±11.0 pts | 48.9% |
| Graduate or professional degree (age 25+) | 14.3% ±6.4 pts | 12.8% |
| Lived in the same house a year earlier | 86.6% ±8.1 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 31.01 earn?
Half of the 963 households in Census Tract 31.01 earn less than $105,180 a year (±$26,756), against $77,404 across Tuolumne County: 2nd highest of the county's 17 tracts with a reliable estimate.
| Measure | Tract 31.01 | Twain Harte |
|---|---|---|
| Median household income | $105,180 ±$26,756 | $88,739 |
| Mean household income | $114,459 ±$19,039 | $133,930 |
| Per capita income | $46,291 ±$11,724 | $57,127 |
| People below the poverty line | 10.3% ±6.9 pts | 9.7% |
| Children under 18 below the poverty line | 1.8% ±3.6 pts | 0.0% |
| Households receiving SNAP | 8.1% ±7.3 pts | 10.5% |
| Households with a computer | 98.9% ±1.6 pts | 98.8% |
| Households with a broadband subscription | 97.3% ±2.9 pts | 99.1% |
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 31.01?
Owners occupy 74.5% of Census Tract 31.01's occupied homes and renters 25.5%. The median owner-occupied home is valued at $468,900 by its owner (±$43,562). The median renter pays $2,037 a month including utilities.
| Measure | Tract 31.01 | Twain Harte |
|---|---|---|
| Median home value (owner-occupied) | $468,900 ±$43,562 | $462,700 |
| Median gross rent | $2,037 ±$511 | $1,893 |
| Renters paying 35% or more of income on rent | 34.9% ±26.7 pts | 39.4% |
| Median monthly owner costs, with a mortgage | $2,297 ±$321 | $2,270 |
| Owner-occupied homes | 74.5% ±11.9 pts | 83.8% |
| Renter-occupied homes | 25.5% ±11.9 pts | 16.2% |
| Housing units | 2,104 ±212 | 2,260 |
| Single-family detached homes | 93.3% ±4.2 pts | 92.4% |
| Mobile homes | 0.4% ±0.5 pts | 0.0% |
| Built 2020 or later | 0.0% ±2.0 pts | 0.0% |
| Built 2010 to 2019 | 0.7% ±1.0 pts | 0.0% |
| Built 1939 or earlier | 8.4% ±6.1 pts | 7.7% |
| Households with no vehicle | 0.3% ±0.6 pts | 0.0% |
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 31.01 get to work?
65.8% of Census Tract 31.01's workers drive alone. The average trip to work takes 32.5 minutes.
| Measure | Tract 31.01 | Twain Harte |
|---|---|---|
| In the labor force (age 16+) | 50.0% ±11.1 pts | 45.2% |
| Unemployment rate | 3.7% ±5.2 pts | 0.0% |
| Drove alone to work | 65.8% ±16.2 pts | 64.0% |
| Carpooled | 7.1% ±7.6 pts | 4.9% |
| Public transportation | 0.0% ±4.4 pts | 0.0% |
| Walked | 17.8% ±19.7 pts | 1.6% |
| Worked from home | 9.0% ±7.4 pts | 22.8% |
| Mean travel time to work | 32.5 min ±9.6 | 37.7 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 31.01 compare with the other tracts in Tuolumne County?
Among Tuolumne County's tracts with a reliable estimate, Census Tract 31.01 ranks as shown below (1 = highest).
| Measure | In Tuolumne County |
|---|---|
| Population | 12th of 18 |
| Residents per square mile | 5th of 18 |
| Median household income | 2nd of 17 |
| Per capita income | 7th of 17 |
| Median home value | 4th of 17 |
| Median gross rent | 1st of 14 |
| Bachelor's degree or higher | 2nd of 17 |
| Median age | 7th of 18 |
| Owner-occupied share | 10th of 17 |
The tracts next to it on Tuolumne County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 22.02 | 1st | $109,213±$15,198 · within the margin of this tract |
| Tract 31.01 | 2nd | $105,180±$26,756 |
| Tract 51.02 | 3rd | $100,705±$38,598 · within the margin of this tract |
| Tract 11 | 4th | $93,094±$20,943 · within the margin of this tract |
| Tract 42.01 | 5th | $91,042±$20,148 · 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 31.01?
5 of the 18 figures for Census Tract 31.01 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