55,649 people (2024 Census estimate, −1.0% since 2020)
309 square miles of land · 180 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.
27 active community water systems list Marion County in the area they serve, reporting 58,115 people served in all (a system that crosses county lines counts its whole population).
| FAIRMONT CITY OF surface water · local government · WV3302502 | 30,586 served |
| VALLEY FALLS PSD buys surface water · local government · WV3302523 | 4,042 served |
| MONONGAH TOWN OF surface water · local government · WV3302515 | 3,226 served |
| LITTLE CREEK PSD buys surface water · local government · WV3302510 | 2,180 served |
| MONUMENTAL PSD buys surface water · local government · WV3302517 | 1,965 served |
| MANNINGTON CITY OF buys surface water · local government · WV3302513 | 1,946 served |
| TRI-COUNTY WATER ASSOC - FAIRMONT buys surface water · local government · WV3302522 | 1,880 served |
| RIVESVILLE TOWN OF buys surface water · local government · WV3302519 | 1,267 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 121 people were held in Marion County's jail, in Vera's latest figure (2024), or 342 per 100,000 residents ages 15–64. In 2019 it was about 122.
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 Marion County. School taxes are usually the largest part of a property tax bill.
Spent $112.1 million — $104.5 million to run schools, about $14,106 per student, plus $6.9 million on buildings and equipment. Money in: $40.5 million local (mostly property tax), $55.3 million state, $17.6 million federal.
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 Marion County about $29.6 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.
193 bridges in Marion County: 93 in good condition, 59 fair, and 41 poor (21.2%). “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.
| INTERSTATE 79 SB over WV 310 · built 1966 | 21,200 vehicles a day |
| INTERSTATE 79 SB over Marion County Rt. 76 · built 1967 | 16,200 vehicles a day |
| I 79 NB over Marion CR 33 · built 1968 | 15,950 vehicles a day |
| I 79 SB over Marion CR 33 · built 1968 | 15,950 vehicles a day |
| INTERSTATE 79 NB over Marion County Rt. 76 · built 1967 | 15,600 vehicles a day |
| COUNTY ROUTE 73 over PRICKETT CREEK · built 1955 | 6,900 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $28.8 million of work in Marion County in fiscal 2025, about $513 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 West Virginia 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 West Virginia: the state government and every county in West Virginia.
Nearby counties: Monongalia County (13 mi) · Taylor County (16 mi) · Harrison County (17 mi) · Wetzel County (22 mi) · Greene County, PA (24 mi) · Barbour County (28 mi).