9,864 people (2024 Census estimate, +0.6% since 2020)
336 square miles of land · 29 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.
5 active community water systems list Martin County in the area they serve, reporting 14,412 people served in all (a system that crosses county lines counts its whole population).
| NAVAL WEAPONS STATION, CRANE surface water · federal · IN5251003 | 6,538 served |
| EAST FORK WATER groundwater · private · IN5251004 | 3,485 served |
| LOOGOOTEE WATER WORKS groundwater · local government · IN5251005 | 2,800 served |
| SHOALS WATER COMPANY groundwater · local government · IN5251007 | 1,296 served |
| CRANE WATER WORKS buys groundwater · local government · IN5251002 | 293 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 75 people were held in Martin County's jail, in Vera's latest figure (2024), or 1,263 per 100,000 residents ages 15–64. In 2019 it was about 80.
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 Martin County. School taxes are usually the largest part of a property tax bill.
Spent $10.8 million — $8.7 million to run schools, about $11,629 per student, plus $1.3 million on buildings and equipment. Money in: $3.3 million local (mostly property tax), $6.5 million state, $1.7 million federal. Long-term debt: $9.7 million.
Spent $8.1 million — $7.4 million to run schools, about $11,048 per student, plus $633,000 on buildings and equipment. Money in: $2.2 million local (mostly property tax), $5.3 million state, $928,000 federal. Long-term debt: $1.1 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: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Martin County about $5.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
104 bridges in Martin County: 41 in good condition, 55 fair, and 8 poor (7.7%). “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.
| ROUTE H-85 over TRIBUTARY/TURKEY CREEK · built 1942 | 200 vehicles a day |
| BROOKS BRIDGE ROAD over EAST FORK OF WHITE RIVER · built 1894 | 107 vehicles a day |
| DEEP CUT LAKE ROAD over BEAVER CREEK · built 1890 | 100 vehicles a day |
| DEEP CUT LAKE ROAD over BEAVER CREEK · built 1921 | 100 vehicles a day |
| DEEP CUT LAKE ROAD over BEAVER CREEK · built 1890 | 97 vehicles a day |
| DEEP CUT LAKE ROAD over BEAVER CREEK · built 1890 | 63 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $3.5 million of work in Martin County in fiscal 2025, about $362 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 Martin 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 Martin County built: brayden.ozark@gmail.com.
More of Indiana: the state government and every county in Indiana.
Nearby counties: Daviess County (15 mi) · Lawrence County (19 mi) · Orange County (20 mi) · Dubois County (23 mi) · Greene County (26 mi) · Pike County (31 mi).