19,561 people (2024 Census estimate, −2.2% since 2020)
712 square miles of land · 27 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.
9 active community water systems list Martin County in the area they serve, reporting 14,932 people served in all (a system that crosses county lines counts its whole population).
| Fairmont surface water · local government · MN1460003 | 10,328 served |
| Truman groundwater · local government · MN1460010 | 1,115 served |
| Sherburn groundwater · local government · MN1460007 | 1,058 served |
| Trimont groundwater · local government · MN1460009 | 734 served |
| Welcome groundwater · local government · MN1460011 | 653 served |
| Ceylon groundwater · local government · MN1460001 | 369 served |
| Granada groundwater · local government · MN1460004 | 297 served |
| Northrop groundwater · local government · MN1460006 | 211 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 21 people were held in Martin County's jail, in Vera's latest figure (2020), or 184 per 100,000 residents ages 15–64. In 2015 it was about 20.
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.
4 school districts have their office in Martin County. School taxes are usually the largest part of a property tax bill.
Spent $32.7 million — $25.8 million to run schools, about $14,209 per student, plus $3.7 million on buildings and equipment. Money in: $7.1 million local (mostly property tax), $20.4 million state, $3.2 million federal. Long-term debt: $35.5 million.
Spent $11.1 million — $9.2 million to run schools, about $14,222 per student, plus $705,000 on buildings and equipment. Money in: $2.8 million local (mostly property tax), $7.2 million state, $755,000 federal. Long-term debt: $8.1 million.
Spent $6.1 million — $5.3 million to run schools, about $16,018 per student, plus $379,000 on buildings and equipment. Money in: $1.9 million local (mostly property tax), $3.9 million state, $567,000 federal. Long-term debt: $5 million.
Spent $5.2 million — $4.6 million to run schools, about $18,780 per student, plus $206,000 on buildings and equipment. Money in: $1.4 million local (mostly property tax), $3 million state, $682,000 federal. Long-term debt: $123,000.
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 Martin County about $13.1 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
162 bridges in Martin County: 75 in good condition, 48 fair, and 39 poor (24.1%). “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.
| CSAH 27 over ELM CREEK · built 1977 | 1,456 vehicles a day |
| CSAH 39 over ELM CREEK · built 1966 | 1,153 vehicles a day |
| CSAH 53 over CENTER CREEK · built 1930 | 1,089 vehicles a day |
| CSAH 38 over ELM CREEK · built 1964 | 530 vehicles a day |
| CSAH 8 over TUTTLE LAKE OUTLET · built 1959 | 480 vehicles a day |
| CSAH 18 over SOUTH CREEK · built 1971 | 435 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $4.3 million of work in Martin County in fiscal 2025, about $216 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 Minnesota 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 Minnesota: the state government and every county in Minnesota.
Nearby counties: Watonwan County (21 mi) · Emmet County, IA (22 mi) · Faribault County (30 mi) · Jackson County (30 mi) · Blue Earth County (34 mi) · Kossuth County, IA (36 mi).