194,345 people (2024 Census estimate, −1.0% since 2020)
868 square miles of land · 224 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.
42 active community water systems list Sangamon County in the area they serve, reporting 182,233 people served in all (a system that crosses county lines counts its whole population).
| SPRINGFIELD surface water · local government · IL1671200 | 117,444 served |
| CHATHAM buys groundwater · local government · IL1670300 | 16,423 served |
| CURRAN-GARDNER TOWNSHIP PWD groundwater · local government · IL1675350 | 6,651 served |
| WILLIAMSVILLE buys surface water · local government · IL1671300 | 6,198 served |
| AUBURN buys surface water · local government · IL1670050 | 4,574 served |
| RIVERTON groundwater · local government · IL1670950 | 4,279 served |
| ROCHESTER buys surface water · local government · IL1671000 | 3,856 served |
| PAWNEE buys surface water · local government · IL1670850 | 2,700 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 323 people were held in Sangamon County's jail, in Vera's latest figure (2023), or 267 per 100,000 residents ages 15–64. In 2018 it was about 335.
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.
10 school districts have their office in Sangamon County. School taxes are usually the largest part of a property tax bill.
Spent $372.4 million — $284 million to run schools, about $21,735 per student, plus $68.1 million on buildings and equipment. Money in: $138.6 million local (mostly property tax), $140.9 million state, $53.7 million federal. Long-term debt: $161.1 million.
Spent $59.9 million — $53.8 million to run schools, about $11,568 per student, plus $4.6 million on buildings and equipment. Money in: $48.1 million local (mostly property tax), $14.1 million state, $4.6 million federal. Long-term debt: $33.8 million.
Spent $33.6 million — $30.1 million to run schools, about $14,490 per student, plus $1.9 million on buildings and equipment. Money in: $18.2 million local (mostly property tax), $15.1 million state, $1.1 million federal. Long-term debt: $32.2 million.
Spent $38.3 million — $18.7 million to run schools, about $12,513 per student, plus $16.4 million on buildings and equipment. Money in: $13.6 million local (mostly property tax), $10.4 million state, $1 million federal. Long-term debt: $54 million.
Spent $24.3 million — $17.9 million to run schools, about $14,347 per student, plus $4.7 million on buildings and equipment. Money in: $15.6 million local (mostly property tax), $6.1 million state, $1.1 million federal. Long-term debt: $13.8 million.
Spent $26.6 million — $18.7 million to run schools, about $14,945 per student, plus $5 million on buildings and equipment. Money in: $8.3 million local (mostly property tax), $13.5 million state, $5.3 million federal. Long-term debt: $15.6 million.
Spent $17.5 million — $14.6 million to run schools, about $13,132 per student, plus $2 million on buildings and equipment. Money in: $7.5 million local (mostly property tax), $10.7 million state, $1.9 million federal. Long-term debt: $7.3 million.
Spent $17.7 million — $14 million to run schools, about $16,260 per student, plus $2.4 million on buildings and equipment. Money in: $12 million local (mostly property tax), $4.7 million state, $1.2 million federal. Long-term debt: $3.8 million.
And 2 more.
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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Sangamon County about $114.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
464 bridges in Sangamon County: 261 in good condition, 175 fair, and 28 poor (6.0%). “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-55 (NB) over IL 104 / I & M RR · built 1972 | 15,550 vehicles a day |
| I-55 (SB) over IL 104 / I & M RR · built 1972 | 15,550 vehicles a day |
| I-55 (NB) over SANGAMON RIVER · built 1963 | 14,600 vehicles a day |
| I-55 SB over SANGAMON RIVER · built 1963 | 14,600 vehicles a day |
| I-55 (NB) over BL 55 & UP RR · built 1962 | 14,600 vehicles a day |
| FAS 629 over SPRING CREEK · built 1974 | 4,100 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $2.5 billion of work in Sangamon County in fiscal 2025, about $12,555 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 Illinois 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 Sangamon 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 Sangamon County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: Menard County (20 mi) · Christian County (25 mi) · Morgan County (29 mi) · Logan County (30 mi) · Cass County (34 mi) · Mason County (36 mi).