51,218 people (2024 Census estimate, −0.8% since 2020)
738 square miles of land · 69 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.
14 active community water systems list St. Martin Parish in the area they serve, reporting 75,994 people served in all (a system that crosses county lines counts its whole population).
| VILLAGE OF PARKS WATER SYSTEM groundwater · local government · LA1099008 | 12,801 served |
| CECILIA WATER CORPORATION groundwater · private · LA1099005 | 12,420 served |
| BAYOU TECHE WATER WORKS groundwater · private · LA1099002 | 10,137 served |
| CITY OF BREAUX BRIDGE WATER SYSTEM groundwater · local government · LA1099003 | 10,098 served |
| CITY OF ST. MARTINVILLE WATER SYSTEM groundwater · local government · LA1099007 | 7,263 served |
| HENDERSON NINA WATER SYSTEM INC groundwater · private · LA1099006 | 6,010 served |
| UNITED WATER SYSTEM groundwater · private · LA1099009 | 4,446 served |
| TOWN OF ARNAUDVILLE WATER SYSTEM groundwater · local government · LA1099001 | 3,957 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 192 people were held in St. Martin Parish's jail, in Vera's latest figure (2023), or 598 per 100,000 residents ages 15–64. In 2018 it was about 160.
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.
1 school district has its office in St. Martin Parish. School taxes are usually the largest part of a property tax bill.
Spent $111.7 million — $102 million to run schools, about $13,528 per student, plus $4.8 million on buildings and equipment. Money in: $39.9 million local (mostly property tax), $46.3 million state, $27.7 million federal. Long-term debt: $103.8 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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost St. Martin Parish about $47 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
117 bridges in St. Martin Parish: 46 in good condition, 61 fair, and 10 poor (8.5%). “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.
| LA0350 over BAYOU TECHE PARKS · built 1950 | 3,378 vehicles a day |
| LA0352 over BAYOU AMY · built 1968 | 2,711 vehicles a day |
| Sawmill Rd. over COULEE DATIDER · built 1975 | 1,100 vehicles a day |
| I0010 over RAMP B. OFF RAMP · built 1971 | 970 vehicles a day |
| LA0975 over CREEK · built 1968 | 231 vehicles a day |
| LA0975 over CREEK · built 1968 | 231 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $12.5 million of work in St. Martin Parish in fiscal 2025, about $242 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 Louisiana 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 St. Martin Parish 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 St. Martin Parish built: brayden.ozark@gmail.com.
More of Louisiana: the state government and every county in Louisiana.
Nearby counties: Iberville Parish (18 mi) · Lafayette Parish (28 mi) · West Baton Rouge Parish (30 mi) · St. Mary Parish (35 mi) · Assumption Parish (36 mi) · Iberia Parish (38 mi).