15,642 people (2024 Census estimate, −2.8% since 2020)
3,179 square miles of land · 5 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.
17 active community water systems list Trinity County in the area they serve, reporting 9,293 people served in all (a system that crosses county lines counts its whole population).
| WEAVERVILLE C.S.D. surface water · local government · CA5310001 | 3,975 served |
| TRINITY CO. W.W. DIST #1 surface water · local government · CA5310002 | 2,324 served |
| TRINITY CENTER M.W.C. surface water · private · CA5310003 | 729 served |
| LEWISTON COMMUNITY SERVICES DISTRICT surface water · private · CA5301002 | 677 served |
| TRINITY VILLAGE MUTUAL WATER surface water · private · CA5304102 | 330 served |
| SALYER MUTUAL WC (FORMERLY RIVERVIEW AC) surface water · private · CA5304501 | 231 served |
| PINE COVE RV PARK groundwater · private · CA5301008 | 223 served |
| TRINITY KNOLLS MUTUAL WATER COMPANY groundwater · private · CA5301102 | 138 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 39 people were held in Trinity County's jail, in Vera's latest figure (2025). In 2020 it was about 56.
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.
10 school districts have their office in Trinity County. School taxes are usually the largest part of a property tax bill.
Spent $18.3 million — $11.7 million to run schools, about $17,371 per student, plus $6.3 million on buildings and equipment. Money in: $4.4 million local (mostly property tax), $9.2 million state, $3.3 million federal.
Spent $6.6 million — $6.1 million to run schools, about $18,672 per student, plus $39,000 on buildings and equipment. Money in: $2.9 million local (mostly property tax), $4.7 million state, $1.1 million federal. Long-term debt: $5.3 million.
Spent $2.8 million — $2.7 million to run schools, about $16,414 per student, plus $8,000 on buildings and equipment. Money in: $583,000 local (mostly property tax), $2.4 million state, $508,000 federal.
Spent $2 million — $1.6 million to run schools, about $17,956 per student, plus $379,000 on buildings and equipment. Money in: $480,000 local (mostly property tax), $1.6 million state, $402,000 federal.
Spent $3 million — $2.7 million to run schools, about $32,333 per student, plus $69,000 on buildings and equipment. Money in: $1.2 million local (mostly property tax), $2.3 million state, $460,000 federal. Long-term debt: $2 million.
Spent $1.6 million — $1.4 million to run schools, about $18,333 per student, plus $165,000 on buildings and equipment. Money in: $607,000 local (mostly property tax), $950,000 state, $305,000 federal.
Spent $1.4 million — $1.4 million to run schools, about $21,810 per student. Money in: $344,000 local (mostly property tax), $1.2 million state, $209,000 federal.
Spent $12.6 million — $7.7 million to run schools, about $546,714 per student, plus $92,000 on buildings and equipment. Money in: $2.6 million local (mostly property tax), $8.7 million state, $2.8 million federal.
And 2 more.
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 Trinity County about $29.1 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.
194 bridges in Trinity County: 112 in good condition, 75 fair, and 7 poor (3.6%). “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.
| HYAMPOM ROAD over LITTLE CREEK · built 1955 | 330 vehicles a day |
| SUMMIT CREEK ROAD over CARR CREEK · built 1987 | 300 vehicles a day |
| STATE ROUTE 3 over COFFEE CREEK OVERFLOW · built 1968 | 230 vehicles a day |
| STEINER FLAT ROAD over DUTTON CREEK · built 1950 | 100 vehicles a day |
| WILDWOOD-MAD RIVER over DUBAKELLA CREEK · built 1972 | 50 vehicles a day |
| MAY over RATTLESNAKE CREEK · built 1959 | 50 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $31.4 million of work in Trinity County in fiscal 2025, about $1,948 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 Trinity 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 Trinity County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Humboldt County (43 mi) · Shasta County (57 mi) · Tehama County (59 mi) · Siskiyou County (72 mi) · Glenn County (81 mi) · Mendocino County (86 mi).