City in Contra Costa County, California · 3.8 sq mi · 2,812 people per sq mi
10,798 people live in Clayton. The typical household earns $175,707, and the median resident is 43.8 years old.
2026 projection
From 11,070 in 2020
Poverty rate 2.49%
Men 40.8 · Women 45.6
1970–2026
10,798
2026 projection
2.5% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1970–2026
10,798
2026 projection
2.5% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 10,798 | -44 | 0.41% |
|---|---|---|---|
| 2025 | 10,842 | -45 | 0.41% |
| 2024 | 10,887 | +38 | 0.35% |
| 2023 | 10,849 | -29 | 0.27% |
| 2022 | 10,878 | -108 | 0.98% |
| 2021 | 10,986 | -84 | 0.76% |
| 2020 | 11,070 | -67 | 0.60% |
| 2019 | 11,137 | -81 | 0.72% |
| 2018 | 11,218 | -51 | 0.45% |
| 2017 | 11,269 | -19 | 0.17% |
Showing 10 of 21 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Clayton has a population change lower than Contra Costa County, California, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 109 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 40 residents
55% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 55% | 60% | 51% |
| Never married | 29% | 31% | 26% |
| Divorced | 8% | 6% | 9% |
| Widowed | 7% | 2% | 11% |
| Separated | 2% | 2% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources