170,614 people (2024 Census estimate, +5.1% since 2020)
320 square miles of land · 532 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.
8 active community water systems list Johnson County in the area they serve, reporting 143,205 people served in all (a system that crosses county lines counts its whole population).
| INDIANA AMERICAN WATER - JOHNSON COUNTY groundwater · private · IN5241005 | 86,813 served |
| BARGERSVILLE WATER DEPARTMENT groundwater · local government · IN5241001 | 34,418 served |
| WHITELAND WATER WORKS buys groundwater · local government · IN5241009 | 5,955 served |
| CAMP ATTERBURY buys groundwater · federal · IN5241015 | 5,300 served |
| EDINBURGH WATER UTILITY groundwater · local government · IN5241002 | 4,480 served |
| PRINCES LAKE WATER DEPARTMENT groundwater · local government · IN5241007 | 4,095 served |
| TRAFALGAR WATER DEPARTMENT buys groundwater · local government · IN5241014 | 1,490 served |
| INDIANA MASONIC HOME buys groundwater · private · IN5241010 | 654 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 322 people were held in Johnson County's jail, in Vera's latest figure (2024), or 298 per 100,000 residents ages 15–64. In 2019 it was about 350.
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.
6 school districts have their office in Johnson County. School taxes are usually the largest part of a property tax bill.
Spent $162.7 million — $106.2 million to run schools, about $11,138 per student, plus $46.7 million on buildings and equipment. Money in: $47.2 million local (mostly property tax), $83.3 million state, $7.5 million federal. Long-term debt: $165.9 million.
Spent $100.6 million — $87.2 million to run schools, about $13,680 per student, plus $7.4 million on buildings and equipment. Money in: $50.5 million local (mostly property tax), $65.1 million state, $5.7 million federal. Long-term debt: $83.6 million.
Spent $80.8 million — $58.7 million to run schools, about $11,894 per student, plus $16.9 million on buildings and equipment. Money in: $35.1 million local (mostly property tax), $38.7 million state, $5.4 million federal. Long-term debt: $60.7 million.
Spent $53.4 million — $45.3 million to run schools, about $11,426 per student, plus $5.3 million on buildings and equipment. Money in: $14.7 million local (mostly property tax), $37.9 million state, $4.7 million federal. Long-term debt: $47.8 million.
Spent $33.4 million — $23.3 million to run schools, about $11,120 per student, plus $8.1 million on buildings and equipment. Money in: $9.7 million local (mostly property tax), $19.4 million state, $1.8 million federal. Long-term debt: $5.1 million.
Spent $11.7 million — $9.4 million to run schools, about $11,185 per student, plus $1.8 million on buildings and equipment. Money in: $2.8 million local (mostly property tax), $7.8 million state, $1.3 million federal. Long-term debt: $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 Johnson County about $53.5 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
230 bridges in Johnson County: 92 in good condition, 115 fair, and 23 poor (10.0%). “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.
| SMITH VALLEY ROAD over CONRAIL RAILROAD · built 1972 | 16,930 vehicles a day |
| CR 500 NORTH over GRASSY CREEK · built 1985 | 7,111 vehicles a day |
| CR 700 NORTH over LEATHERWOOD CREEK · built 1950 | 3,191 vehicles a day |
| CR 700 NORTH over CAMPBELL DITCH · built 1978 | 3,191 vehicles a day |
| CR 300 SOUTH over VANDIVER DITCH · built 1978 | 2,540 vehicles a day |
| LEISURE LANE over PLEASANT RUN CREEK · built 1955 | 2,061 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $30.6 million of work in Johnson County in fiscal 2025, about $189 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 Johnson 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 Johnson County built: brayden.ozark@gmail.com.
More of Indiana: the state government and every county in Indiana.
Nearby counties: Shelby County (16 mi) · Morgan County (19 mi) · Marion County (20 mi) · Brown County (22 mi) · Bartholomew County (23 mi) · Hancock County (28 mi).