225,251 people (2024 Census estimate, +3.4% since 2020)
1,013 square miles of land · 222 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.
16 active community water systems list Yolo County in the area they serve, reporting 213,666 people served in all (a system that crosses county lines counts its whole population).
| CITY OF DAVIS buys surface water · local government · CA5710001 | 67,826 served |
| CITY OF WOODLAND buys surface water · local government · CA5710006 | 61,462 served |
| CITY OF WEST SACRAMENTO surface water · local government · CA5710003 | 55,991 served |
| UC - DAVIS buys surface water · state · CA5710009 | 13,177 served |
| CITY OF WINTERS groundwater · local government · CA5710005 | 7,115 served |
| ESPARTO C.S.D. groundwater · local government · CA5710007 | 3,572 served |
| WILD WINGS GOLF COMMUNITY groundwater · private · CA5710011 | 1,115 served |
| KNIGHTS LANDING SVC. DIST. groundwater · local government · CA5710004 | 1,099 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 270 people were held in Yolo County's jail, in Vera's latest figure (2025). In 2020 it was about 227.
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.
6 school districts have their office in Yolo County. School taxes are usually the largest part of a property tax bill.
Spent $161.6 million — $153.2 million to run schools, about $16,077 per student, plus $3.4 million on buildings and equipment. Money in: $55.8 million local (mostly property tax), $126.4 million state, $19.8 million federal. Long-term debt: $17.1 million.
Spent $186 million — $140.3 million to run schools, about $16,704 per student, plus $35.3 million on buildings and equipment. Money in: $90.7 million local (mostly property tax), $77 million state, $8.3 million federal. Long-term debt: $210.9 million.
Spent $139.3 million — $118.7 million to run schools, about $15,988 per student, plus $5.9 million on buildings and equipment. Money in: $48.5 million local (mostly property tax), $105.5 million state, $17.8 million federal. Long-term debt: $204.7 million.
Spent $32.9 million — $25.5 million to run schools, about $16,282 per student, plus $4.6 million on buildings and equipment. Money in: $11.6 million local (mostly property tax), $24.4 million state, $2.2 million federal. Long-term debt: $39.8 million.
Spent $18.4 million — $17.2 million to run schools, about $18,041 per student, plus $675,000 on buildings and equipment. Money in: $6.3 million local (mostly property tax), $13.3 million state, $1.6 million federal. Long-term debt: $1.2 million.
Spent $52.4 million — $25.6 million to run schools, about $125,279 per student, plus $1.1 million on buildings and equipment. Money in: $21.5 million local (mostly property tax), $24.9 million state, $12.9 million federal. Long-term debt: $5 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 Yolo County about $116.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
274 bridges in Yolo County: 121 in good condition, 141 fair, and 12 poor (4.4%). “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.
| US HWY 50 (I-305) over WESTACRE RD · built 1951 | 90,000 vehicles a day |
| NB JEFFERSON BLVD over DEEP WATER CANAL · built 1960 | 17,439 vehicles a day |
| INDUSTRIAL BLVD over DEEP WATER CANAL & RR · built 1997 | 6,000 vehicles a day |
| COUNTY ROAD 99S over INTERSTATE 5 · built 1973 | 5,000 vehicles a day |
| COUNTY ROAD 17 over INTERSTATE 5 · built 1970 | 5,000 vehicles a day |
| C STREET over UP RR BNSF RY AMTRAK 2ND · built 1958 | 4,620 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $275.1 million of work in Yolo County in fiscal 2025, about $1,271 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 Yolo 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 Yolo County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Napa County (26 mi) · Sutter County (27 mi) · Solano County (29 mi) · Sacramento County (34 mi) · Colusa County (39 mi) · Yuba County (51 mi).