Census tract · San Diego County
Census Tract 203.10, San Diego County, California
Census Tract 203.10, GEOID 06073020310, in San Diego County, California, mostly within San Marcos (95% of its census blocks). 9,019 residents in the ACS 2020-2024 5-year estimates (±1,183); the 2020 Census counted 8,703.
Residents, 2020-2024
9,019
±1,183 (90% margin)
2020 Census count: 8,703
Median household income
$111,270
±$23,585 (90% margin)
San Diego County: $106,268
Median home value
$788,700
±$60,568 (90% margin)
San Diego County: $854,700
Median gross rent
$2,873
±$184 (90% margin)
San Diego County: $2,246
Where is Census Tract 203.10?
Census Tract 203.10 is one of 737 census tracts in San Diego County, California. It covers 2.20 square miles of land, 3,963 residents per square mile in 2020. Its GEOID, 06073020310, names it uniquely (how tract numbers and GEOIDs work).
| Place | Share of the tract |
|---|---|
| San Marcos | 95% |
| Harmony Grove | 5% |
6 census tracts border Census Tract 203.10: Tract 200.23 ($97,031), Tract 200.25 ($82,796), Tract 200.26 ($135,238), Tract 200.43 ($237,188), Tract 200.44 ($213,196) and Tract 203.11 ($130,764). 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 203.10?
The 2020-2024 American Community Survey puts Census Tract 203.10's population at 9,019 (±1,183) in 2,638 households; the 2020 Census counted 8,703 residents and 2,946 housing units.
| Measure | Tract 203.10 | San Marcos |
|---|---|---|
| Total population | 9,019 ±1,183 | 94,882 |
| Households | 2,638 ±302 | 31,350 |
| Average household size | 2.92 ±0.26 | 2.96 |
| Housing units | 2,962 ±239 | 32,557 |
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 203.10?
The median resident of Census Tract 203.10 is 28.2 years old; 21.8% are under 18 and 4.1% are 65 or older. The largest group is non-Hispanic white residents at 49.3%, then Hispanic or Latino residents (of any race) at 25.6%. 16.7% of residents were born outside the United States.
| Measure | Tract 203.10 | San Marcos |
|---|---|---|
| Median age | 28.2 ±4.1 | 36.8 |
| Under 18 years | 21.8% ±4.0 pts | 25.2% |
| 65 years and over | 4.1% ±2.0 pts | 13.2% |
| Hispanic or Latino (any race) | 25.6% ±7.0 pts | 36.8% |
| White alone, not Hispanic | 49.3% ±6.8 pts | 43.8% |
| Black or African American alone, not Hispanic | 1.9% ±1.1 pts | 1.2% |
| Asian alone, not Hispanic | 13.0% ±4.0 pts | 11.7% |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.5 pts | 0.1% |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.5 pts | 0.1% |
| Two or more races, not Hispanic | 9.0% ±2.9 pts | 5.9% |
| Some other race alone, not Hispanic | 1.2% ±1.4 pts | 0.4% |
| Born outside the United States | 16.7% ±5.4 pts | 22.3% |
| Speak a language other than English at home (age 5+) | 20.1% ±7.9 pts | 35.2% |
| Civilian veterans (age 18+) | 3.9% ±1.8 pts | 5.8% |
| With a disability | 9.9% ±4.1 pts | 10.8% |
| No health insurance coverage | 3.8% ±3.0 pts | 7.1% |
| High school graduate or higher (age 25+) | 97.7% ±2.1 pts | 88.2% |
| Bachelor's degree or higher (age 25+) | 42.8% ±8.4 pts | 43.8% |
| Graduate or professional degree (age 25+) | 15.0% ±5.3 pts | 15.5% |
| Lived in the same house a year earlier | 80.5% ±7.7 pts | 87.8% |
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 203.10 earn?
Half of the 2,638 households in Census Tract 203.10 earn less than $111,270 a year (±$23,585), against $106,268 across San Diego County: 355th highest of the county's 725 tracts with a reliable estimate. 5.7% of residents live below the poverty line.
| Measure | Tract 203.10 | San Marcos |
|---|---|---|
| Median household income | $111,270 ±$23,585 | $109,377 |
| Mean household income | $120,175 ±$13,857 | $141,381 |
| Per capita income | $36,758 ±$4,191 | $47,841 |
| People below the poverty line | 5.7% ±3.5 pts | 9.2% |
| Children under 18 below the poverty line | 3.1% ±3.7 pts | 7.6% |
| Households receiving SNAP | 7.5% ±7.0 pts | 7.9% |
| Households with a computer | 99.4% ±1.0 pts | 98.5% |
| Households with a broadband subscription | 98.4% ±1.9 pts | 95.9% |
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 203.10?
Owners occupy 48.9% of Census Tract 203.10's occupied homes and renters 51.1%. The median owner-occupied home is valued at $788,700 by its owner (±$60,568). The median renter pays $2,873 a month including utilities, and 56.8% of renters pay 35% or more of their income on rent.
| Measure | Tract 203.10 | San Marcos |
|---|---|---|
| Median home value (owner-occupied) | $788,700 ±$60,568 | $868,000 |
| Median gross rent | $2,873 ±$184 | $2,348 |
| Renters paying 35% or more of income on rent | 56.8% ±12.9 pts | 52.7% |
| Median monthly owner costs, with a mortgage | $2,943 ±$359 | $3,357 |
| Owner-occupied homes | 48.9% ±7.9 pts | 63.7% |
| Renter-occupied homes | 51.1% ±7.9 pts | 36.3% |
| Housing units | 2,962 ±239 | 32,557 |
| Single-family detached homes | 31.2% ±7.7 pts | 52.1% |
| Mobile homes | 0.0% ±1.4 pts | 10.1% |
| Built 2020 or later | 0.9% ±1.4 pts | 2.5% |
| Built 2010 to 2019 | 11.7% ±5.9 pts | 12.1% |
| Built 1939 or earlier | 0.0% ±1.4 pts | 0.5% |
| Households with no vehicle | 0.0% ±1.6 pts | 3.5% |
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 203.10 get to work?
72.1% of Census Tract 203.10's workers drive alone and 14.2% work from home. The average trip to work takes 25.7 minutes. The unemployment rate in 2020-2024 averaged 5.3%.
| Measure | Tract 203.10 | San Marcos |
|---|---|---|
| In the labor force (age 16+) | 71.1% ±5.6 pts | 66.2% |
| Unemployment rate | 5.3% ±2.8 pts | 4.6% |
| Drove alone to work | 72.1% ±6.4 pts | 67.7% |
| Carpooled | 7.0% ±3.8 pts | 8.0% |
| Public transportation | 0.8% ±1.1 pts | 0.5% |
| Walked | 3.7% ±1.9 pts | 1.5% |
| Worked from home | 14.2% ±4.7 pts | 20.5% |
| Mean travel time to work | 25.7 min ±2.1 | 26.5 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 203.10 compare with the other tracts in San Diego County?
Among San Diego County's tracts with a reliable estimate, Census Tract 203.10 ranks as shown below (1 = highest).
| Measure | In San Diego County | In San Marcos |
|---|---|---|
| Population | 11th of 735 | 2nd of 20 |
| Residents per square mile | 509th of 736 | 11th of 20 |
| Median household income | 355th of 725 | 8th of 20 |
| Per capita income | 537th of 734 | 15th of 20 |
| Median home value | 380th of 703 | 11th of 19 |
| Median gross rent | 180th of 703 | 5th of 19 |
| Poverty rate | 393rd of 472 | 9th of 13 |
| Bachelor's degree or higher | 361st of 732 | 9th of 20 |
| Median age | 711th of 735 | 19th of 20 |
| Owner-occupied share | 440th of 708 | 16th of 20 |
The tracts next to it on San Diego County's income ladder
| Tract | Rank | Median household income |
|---|---|---|
| Tract 83.57 | 352nd | $111,332±$24,871 · within the margin of this tract |
| Tract 135.06 | 353rd | $111,304±$21,599 · within the margin of this tract |
| Tract 170.50 | 354th | $111,272±$13,826 · within the margin of this tract |
| Tract 203.10 | 355th | $111,270±$23,585 |
| Tract 164.01 | 356th | $111,250±$18,511 · within the margin of this tract |
| Tract 178.01 | 357th | $111,118±$20,522 · within the margin of this tract |
| Tract 216 | 358th | $111,076±$16,891 · 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 203.10?
Every figure for Census Tract 203.10 on this page has a coefficient of variation under 40%, the Census Bureau's threshold for a usable estimate.
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