17,048 people (2024 Census estimate, −0.5% since 2020)
1,449 square miles of land · 12 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.
11 active community water systems list Mariposa County in the area they serve, reporting 5,684 people served in all (a system that crosses county lines counts its whole population).
| MARIPOSA PUBLIC UTILITY DIST surface water · local government · CA2210001 | 2,000 served |
| YOSEMITE NPS-YOSEMITE VALLEY groundwater · federal · CA2210503 | 1,000 served |
| PONDEROSA BASIN MUTUAL WTR CO groundwater · private · CA2210002 | 798 served |
| YOSEMITE NPS-EL PORTAL groundwater · federal · CA2210515 | 635 served |
| YOSEMITE WEST WATER SYSTEM groundwater · local government · CA2210924 | 420 served |
| MARIPOSA PINES MUTUAL groundwater · private · CA2210906 | 294 served |
| MPWD-COULTERVILLE CSA 1 groundwater · local government · CA2210901 | 193 served |
| YOSEMITE NPS-WAWONA surface water · federal · CA2210510 | 150 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 33 people were held in Mariposa County's jail, in Vera's latest figure (2025). In 2020 it was about 29.
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 Mariposa County. School taxes are usually the largest part of a property tax bill.
Spent $33.3 million — $28.7 million to run schools, about $17,026 per student, plus $3 million on buildings and equipment. Money in: $19.2 million local (mostly property tax), $15.4 million state, $2.7 million federal. Long-term debt: $21.7 million.
Spent $6.2 million — $5.8 million to run schools, about $120,583 per student, plus $8,000 on buildings and equipment. Money in: $2.8 million local (mostly property tax), $2.6 million state, $1.5 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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Mariposa County about $38.1 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Low; social vulnerability: Very High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
109 bridges in Mariposa County: 20 in good condition, 77 fair, and 12 poor (11.0%). “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.
| STATE ROUTE 140 over MILES CREEK · built 1928 | 4,650 vehicles a day |
| EL CAPITAN CROSSOV over MERCED RIVER · built 1933 | 3,416 vehicles a day |
| STATE ROUTE 140 over SLATE GULCH · built 1926 | 1,400 vehicles a day |
| STATE ROUTE 140 over SWEETWATER CREEK · built 1926 | 1,400 vehicles a day |
| STATE ROUTE 140 over SOUTH FORK MERCED RIVER · built 1926 | 1,400 vehicles a day |
| 6TH STREET over MARIPOSA CREEK · built 1950 | 1,080 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $855,468 of work in Mariposa County in fiscal 2025, about $50 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.
General election: Tuesday, November 3, 2026. Ballots mailed; drop boxes open: 2026-10-05. Last day to register to vote: 2026-10-19. Early in-person voting: 2026-10-24 to 2026-11-03. Election Day: 2026-11-03. Last day for mailed ballots to arrive: 2026-11-10.
Source: California Secretary of State — Nov. 3, 2026 key dates · California Official Voter Information Guide — dates to remember · California Secretary of State — make a plan to vote
The budget, property tax rates, audits, local officials and offices for Mariposa 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 Mariposa County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Madera County (27 mi) · Tuolumne County (31 mi) · Merced County (52 mi) · Calaveras County (55 mi) · Fresno County (58 mi) · Stanislaus County (60 mi).