96,927 people (2024 Census estimate, +5.7% since 2020)
632 square miles of land · 153 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
16 active community water systems list St. Clair County in the area they serve, reporting 93,736 people served in all (a system that crosses county lines counts its whole population).
| ODENVILLE, UTILLITIES BD. OF THE TOWN OF buys surface water · local government · AL0001203 | 26,022 served |
| PELL CITY, CITY OF buys surface water · local government · AL0001204 | 17,586 served |
| MARGARET, THE WWB OF THE TOWN OF buys surface water · local government · AL0001199 | 8,070 served |
| NEW LONDON WATER & FP AUTHORITY groundwater · local government · AL0001437 | 6,843 served |
| SPRINGVILLE, CITY OF buys surface water · local government · AL0001211 | 6,468 served |
| WATTSVILLE WATER AUTHORITY groundwater · local government · AL0001216 | 5,097 served |
| COOK SPRINGS WATER AUTHORITY buys groundwater · local government · AL0001434 | 4,569 served |
| ASHVILLE, CITY OF groundwater · local government · AL0001176 | 4,107 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 155 people were held in St. Clair County's jail, in Vera's latest figure (2023), or 254 per 100,000 residents ages 15–64. In 2018 it was about 227.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
2 school districts have their office in St. Clair County. School taxes are usually the largest part of a property tax bill.
Spent $119.3 million — $104.2 million to run schools, about $10,686 per student, plus $10 million on buildings and equipment. Money in: $33.7 million local (mostly property tax), $79.1 million state, $16.6 million federal. Long-term debt: $45.3 million.
Spent $64.3 million — $49.6 million to run schools, about $11,935 per student, plus $12.5 million on buildings and equipment. Money in: $16.9 million local (mostly property tax), $33.2 million state, $9.4 million federal. Long-term debt: $32.2 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost St. Clair County about $32.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
183 bridges in St. Clair County: 48 in good condition, 132 fair, and 3 poor (1.6%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| I - 59 SOUTH over CANOE CREEK · built 1961 | 10,585 vehicles a day |
| I - 59 NORTH over CANOE CREEK · built 1961 | 10,585 vehicles a day |
| JONES ST over LIL CAHABA RV · built 1978 | 10 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $41.3 million of work in St. Clair County in fiscal 2025, about $453 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
Registration deadlines, early voting and polling places for Alabama are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for St. Clair County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have St. Clair County built: brayden.ozark@gmail.com.
More of Alabama: the state government and every county in Alabama.
Nearby counties: Blount County (23 mi) · Talladega County (25 mi) · Etowah County (28 mi) · Calhoun County (28 mi) · Jefferson County (35 mi) · Shelby County (37 mi).