22,074 people (2024 Census estimate, +0.9% since 2020)
1,151 square miles of land · 19 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 Colusa County in the area they serve, reporting 18,328 people served in all (a system that crosses county lines counts its whole population).
| CITY OF COLUSA groundwater · local government · CA0610002 | 6,675 served |
| CITY OF WILLIAMS groundwater · local government · CA0610004 | 5,538 served |
| ARBUCKLE PUBLIC UTILITY DISTRICT groundwater · local government · CA0610001 | 3,251 served |
| MAXWELL PUBLIC UTILITY DISTRICT groundwater · local government · CA0610003 | 1,175 served |
| COLUSA CO. WWD #1 - GRIMES groundwater · local government · CA0600008 | 512 served |
| COLUSA CO. SERVICE AREA #1-CENTURY RANCH surface water · private · CA0600012 | 450 served |
| COLUSA CO. WWD #2 - PRINCETON groundwater · local government · CA0600013 | 382 served |
| DEL ORO WC - ARBUCKLE DISTRICT groundwater · private · CA0605011 | 185 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 54 people were held in Colusa 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.
5 school districts have their office in Colusa County. School taxes are usually the largest part of a property tax bill.
Spent $25.8 million — $22.4 million to run schools, about $14,597 per student, plus $1.8 million on buildings and equipment. Money in: $6.6 million local (mostly property tax), $20.5 million state, $2.8 million federal. Long-term debt: $5.1 million.
Spent $25 million — $20.5 million to run schools, about $13,742 per student, plus $2.9 million on buildings and equipment. Money in: $8.4 million local (mostly property tax), $24.2 million state, $2.2 million federal. Long-term debt: $15.3 million.
Spent $21.6 million — $18.8 million to run schools, about $13,951 per student, plus $923,000 on buildings and equipment. Money in: $5.7 million local (mostly property tax), $25.1 million state, $2.9 million federal. Long-term debt: $15.8 million.
Spent $7.7 million — $6.6 million to run schools, about $19,438 per student, plus $752,000 on buildings and equipment. Money in: $2.4 million local (mostly property tax), $5.3 million state, $722,000 federal.
Spent $3.7 million — $3.2 million to run schools, about $24,068 per student, plus $281,000 on buildings and equipment. Money in: $2.7 million local (mostly property tax), $1.7 million state, $356,000 federal. Long-term debt: $2.7 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 Colusa County about $40.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Low; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
213 bridges in Colusa County: 101 in good condition, 100 fair, and 12 poor (5.6%). “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.
| LONE STAR ROAD over CORTINA CREEK · built 1968 | 2,077 vehicles a day |
| OLD 99W over STONE CORRAL CREEK · built 1927 | 1,976 vehicles a day |
| HUSTED ROAD over INTERSTATE ROUTE 5 · built 1971 | 900 vehicles a day |
| HAHN ROAD over INTERSTATE 5 · built 1967 | 500 vehicles a day |
| COLLEGE CITY RD over CLARKS DITCH · built 1976 | 402 vehicles a day |
| COUNTY LINE RD over COLUSA DRAIN · built 1970 | 170 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $9.6 million of work in Colusa County in fiscal 2025, about $440 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 Colusa 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 Colusa County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Lake County (28 mi) · Sutter County (30 mi) · Glenn County (31 mi) · Yolo County (39 mi) · Napa County (47 mi) · Butte County (48 mi).