San Joaquin County vs Stanislaus County
Two neighbouring counties in California, compared on population, size, income and housing. They share 79 mi of border.
San Joaquin County
California
Stanislaus County
California
Both outlines are drawn at true relative size. Stanislaus County spans about 101.6 km at its widest.
Side by side
| Measure | San Joaquin County | Difference | Stanislaus County |
|---|---|---|---|
| Population | 823,815 | +47.7% | 557,719 |
| Change since 2020 | 5.5% | +4.8 pp | 0.7% |
| Land area | 1,392 sq mi | -6.9% | 1,496 sq mi |
| Population density | 592 per sq mi | +58.7% | 373 per sq mi |
| Median household income | $92,179 | +13.1% | $81,468 |
| Median home value | $530,700 | +17.9% | $450,100 |
| Median age | 35.4 | +1.4% | 34.9 |
| Households | 245,250 | +37.9% | 177,874 |
| Housing units | 260,151 | +40.5% | 185,149 |
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026; US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. The difference column is computed here: the first county's figure against the second, expressed as a percentage of the second. The change-since-2020 row is the exception: two growth rates differ in percentage points (pp), not percent. Retrieved 30 August 2026.
What the numbers say
- San Joaquin County holds about 1.5 times the population of Stanislaus County: 823,815 against 557,719.
- Stanislaus County covers more ground, at 1,496 square miles against 1,392.
- San Joaquin County is the more crowded of the two, at 592 people per square mile against 373.
- Median household income is higher in San Joaquin County, by 10,711 dollars a year.
- Since 2020, San Joaquin County has grown by 5.5% and Stanislaus County has grown by 0.7%.
- They share 79 mi of common border, which the Census Bureau publishes in its county adjacency file and which almost no other county reference presents.
Full pages
Want a different pair? Compare any two of the 3,144 US counties.
Rebuilt from source data 30 August 2026. How these figures are produced.