ZIP code 94528 · Diablo
Contra Costa County: 414,417
Contra Costa County: 32%
Contra Costa County: $2,375
Contra Costa County: $127,000
Contra Costa County: $867,000
Contra Costa County: 1978
“Higher” or “lower” only where the gap exceeds both margins of error combined (90% confidence).
Source: U.S. Census Bureau, American Community Survey 5-year estimates, variance replicate tables (block groups) · Geography: Diablo, apportioned from 2 census block groups · Source updated Jan 29, 2026 · Retrieved Oct 27, 2026 · How these numbers are built
Contra Costa County: 429,260
Contra Costa County: 68%
Contra Costa County: 32%
Survey statistics come from the Census Bureau's American Community Survey, pooled over 2020–2024. They describe that five-year period, not today.
The Census doesn't publish figures for ZIP codes at this level of detail, so we build them from 2 census block groups: 0 lie entirely inside, and 2 only partly, counted by the share of their 2020 Census housing units inside the boundary (100% of homes here sit in those partial block groups).
Margins of error (±) are at 90% confidence, computed from the Census Bureau's 80 variance replicates, so they account for the survey's design. Medians are interpolated from the published brackets. Estimates whose margin is large relative to the value are marked caution (coefficient of variation over 15%) or unreliable (over 30%).
Want the official figures for a single tract or block group? Look up a GEOID on data.census.gov.
Source: U.S. Census Bureau, American Community Survey 5-year estimates, variance replicate tables (block groups) · Geography: census block groups · Source updated Jan 29, 2026 · Retrieved Oct 27, 2026
Source: U.S. Census Bureau (TIGERweb), 2020 Census Blocks (housing units, population, internal points) · Geography: census blocks (apportioning weights) · Retrieved Oct 26, 2026
Contra Costa County: 3.5%
Contra Costa County: 2.8%
Contra Costa County: 0.7%
Source: U.S. Census Bureau, American Community Survey 5-year estimates, variance replicate tables (block groups) · Geography: Diablo, apportioned from 2 census block groups · Source updated Jan 29, 2026 · Retrieved Oct 27, 2026
Contra Costa County: $2,375
Contra Costa County: 56%
Contra Costa County: 28%
Contra Costa County: 3.6%
Source: U.S. Census Bureau, American Community Survey 5-year estimates, variance replicate tables (block groups) · Geography: Diablo, apportioned from 2 census block groups · Source updated Jan 29, 2026 · Retrieved Oct 27, 2026 · Gross rent is what tenants reported paying, including utilities, across all leases (not just new ones).
HUD's 40th-percentile gross rent for standard-quality units recently rented, set for the Housing Choice Voucher program. A program standard, not an estimate of what homes here rent for.
| Area | Studio | 1 BR | 2 BR | 3 BR | 4 BR |
|---|---|---|---|---|---|
| ZIP 94528 | $2,140 | $2,440 | $2,970 | $3,830 | $4,530 |
| Oakland-Fremont metro area | $2,142 | $2,385 | $2,912 | $3,724 | $4,413 |
Source: U.S. Department of Housing and Urban Development (eGIS), Small Area Fair Market Rents (by ZIP) · Geography: ZIP code (Small Area FMR) and HUD FMR area · Retrieved Oct 26, 2026 · Fiscal year 2026 (effective October 1 of the prior year).
Contra Costa County: $127,000
Contra Costa County: $867,000
Source: U.S. Census Bureau, American Community Survey 5-year estimates, variance replicate tables (block groups) · Geography: Diablo, apportioned from 2 census block groups · Source updated Jan 29, 2026 · Retrieved Oct 27, 2026 · Home value is the owner's own estimate, averaged over five survey years. It is not a sale price, appraisal, or assessed value.
A typical (middle-third) home value for the whole ZIP code, which is this area. Not an estimate for any home here.
| ZIP | Typical value | 1-yr change | 5-yr change |
|---|---|---|---|
| 94528 | $3,107,080 | +3.9% | +4.1% |
| Contra Costa County | $768,394 | -0.5% | -3.0% |
Permit activity is summarized for neighborhoods; ZIP pages show new housing reported to the State below.
Units by report year, from each city's Housing Element Annual Progress Report. One project can appear at several stages across years.
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: projects located inside the area · Retrieved Oct 26, 2026
Source: Zillow Research, Zillow Home Value Index (ZHVI), ZIP and County · Geography: ZIP code · Retrieved Oct 26, 2026 · Through September 2026. Data provided by Zillow.