981,628 people (2024 Census estimate, +0.5% since 2020)
396 square miles of land · 2,479 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.
3 active community water systems list Marion County in the area they serve, reporting 939,923 people served in all (a system that crosses county lines counts its whole population).
| CITIZENS WATER - INDIANAPOLIS surface water · local government · IN5249004 | 880,345 served |
| CITY OF LAWRENCE UTILITIES groundwater · local government · IN5249005 | 49,000 served |
| SPEEDWAY WATER WORKS surface water · local government · IN5249008 | 10,578 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 2,133 people were held in Marion County's jail, in Vera's latest figure (2024), or 335 per 100,000 residents ages 15–64. In 2019 it was about 2,292.
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.
11 school districts have their office in Marion County. School taxes are usually the largest part of a property tax bill.
Spent $680.6 million — $601.9 million to run schools, about $27,324 per student, plus $60.5 million on buildings and equipment. Money in: $227.5 million local (mostly property tax), $332.3 million state, $144.6 million federal. Long-term debt: $387.7 million.
Spent $237.6 million — $202.4 million to run schools, about $12,332 per student, plus $34.3 million on buildings and equipment. Money in: $85.9 million local (mostly property tax), $132.3 million state, $43.4 million federal. Long-term debt: $252.2 million.
Spent $263.4 million — $223.3 million to run schools, about $13,765 per student, plus $37.2 million on buildings and equipment. Money in: $74.8 million local (mostly property tax), $161.7 million state, $39.5 million federal. Long-term debt: $83 million.
Spent $322.4 million — $217.4 million to run schools, about $13,516 per student, plus $92.3 million on buildings and equipment. Money in: $84.1 million local (mostly property tax), $133.8 million state, $50.9 million federal. Long-term debt: $286.6 million.
Spent $235.1 million — $169.6 million to run schools, about $14,345 per student, plus $61.3 million on buildings and equipment. Money in: $52.9 million local (mostly property tax), $118.8 million state, $36.7 million federal. Long-term debt: $84.7 million.
Spent $163.7 million — $123.6 million to run schools, about $11,021 per student, plus $38.6 million on buildings and equipment. Money in: $51.5 million local (mostly property tax), $99.4 million state, $9.4 million federal. Long-term debt: $220.7 million.
Spent $183.9 million — $162.3 million to run schools, about $15,188 per student, plus $19.9 million on buildings and equipment. Money in: $47.8 million local (mostly property tax), $87.7 million state, $23.1 million federal. Long-term debt: $39.5 million.
Spent $265.9 million — $174.6 million to run schools, about $16,606 per student, plus $77.6 million on buildings and equipment. Money in: $98.3 million local (mostly property tax), $105.7 million state, $29.3 million federal. Long-term debt: $273.4 million.
And 3 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 High compared with other U.S. counties. FEMA estimates natural hazards cost Marion County about $284.8 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.
969 bridges in Marion County: 448 in good condition, 475 fair, and 46 poor (4.7%). “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-465 over DELAWARE CREEK · built 1966 | 129,314 vehicles a day |
| I-465 over CROOKED CREEK · built 1966 | 129,314 vehicles a day |
| 10TH STREET over BIG EAGLE CREEK · built 1970 | 38,589 vehicles a day |
| 30TH STREET over WHITE RIVER · built 1907 | 35,555 vehicles a day |
| 10TH STREET over LITTLE EAGLE CREEK · built 1988 | 28,240 vehicles a day |
| 16TH STRMLK JR over INDPLS WATER CO CANAL · built 1935 | 25,206 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $1.6 billion of work in Marion County in fiscal 2025, about $1,641 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 Indiana 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 Marion 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 Marion County built: brayden.ozark@gmail.com.
More of Indiana: the state government and every county in Indiana.
Nearby counties: Hancock County (19 mi) · Hamilton County (20 mi) · Hendricks County (20 mi) · Johnson County (20 mi) · Shelby County (26 mi) · Boone County (26 mi).