County Maps US

St. Clair County, Alabama

A county in Alabama, ranked 15 of 67 by population.

CountyFIPS 01115

Within Alabama
St. Clair County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Ashville, the county seat, located via the 2025 Census Gazetteer.

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Population
98,206
+6,503 (+7.1%) since 2020
Land area
631.6
square miles. A further 3.3% of the total area is water
Population density
155
people per square mile, computed rather than published
County seat
Ashville
Seat of county government.
Established
1818
207 years ago
Largest city
Pell City city
Population 14,320.

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; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of St. Clair County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of St. Clair County, Alabama from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 616 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where St. Clair County ranks

Position among the 67 counties of Alabama, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn AlabamaNationally
Population98,20615th of 67637th of 3,144
Land area631.6 sq mi42nd of 671,519th of 3,144
Population density155 per sq mi15th of 67682nd of 3,144
Median household income$77,4636th of 67699th of 3,143

Full data for St. Clair County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population98,206Vintage 2025 Population Estimates
Population in 202091,703Vintage 2025 Population Estimates
2020 estimates base?91,504Vintage 2025 Population Estimates
Land area631.6 sq mi2025 Gazetteer Files
Water area21.7 sq mi2025 Gazetteer Files
Total area653.4 sq mi2025 Gazetteer Files
Population density?155 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$77,463American Community Survey 2020-2024 5-Year Estimates
Median home value$226,300American Community Survey 2020-2024 5-Year Estimates
Median age41.2American Community Survey 2020-2024 5-Year Estimates
Households35,107American Community Survey 2020-2024 5-Year Estimates
Housing units39,247American Community Survey 2020-2024 5-Year Estimates

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. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-96
1,060 births, 1,156 deaths
Net migration
+1,258
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering St. Clair County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Talladega CountyAlabama41 mi81,603
Etowah CountyAlabama32 mi103,886
Blount CountyAlabama25 mi60,156
Jefferson CountyAlabama22 mi665,742
Shelby CountyAlabama19 mi238,552
Calhoun CountyAlabama16 mi115,834

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 67 counties of Alabama

Open the interactive Alabama county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.