816,108 people (2024 Census estimate, +4.5% since 2020)
1,392 square miles of land · 586 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.
93 active community water systems list San Joaquin County in the area they serve, reporting 750,377 people served in all (a system that crosses county lines counts its whole population).
| CITY OF STOCKTON surface water · local government · CA3910012 | 192,702 served |
| CALIFORNIA WATER SERVICE - STOCKTON buys surface water · private · CA3910001 | 182,775 served |
| TRACY, CITY OF surface water · local government · CA3910011 | 98,215 served |
| MANTECA, CITY OF buys surface water · local government · CA3910005 | 84,928 served |
| LODI, CITY OF surface water · local government · CA3910004 | 67,093 served |
| CITY OF LATHROP buys surface water · local government · CA3910015 | 38,596 served |
| CITY OF MOUNTAIN HOUSE surface water · local government · CA3910027 | 26,400 served |
| RIPON, CITY OF groundwater · local government · CA3910007 | 15,753 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 1,258 people were held in San Joaquin County's jail, in Vera's latest figure (2025). In 2020 it was about 1,351.
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.
15 school districts have their office in San Joaquin County. School taxes are usually the largest part of a property tax bill.
Spent $696.8 million — $640.9 million to run schools, about $18,093 per student, plus $28.8 million on buildings and equipment. Money in: $146.5 million local (mostly property tax), $620.1 million state, $126.4 million federal. Long-term debt: $532.3 million.
Spent $502.5 million — $450.7 million to run schools, about $16,495 per student, plus $35.9 million on buildings and equipment. Money in: $119 million local (mostly property tax), $429.9 million state, $58.7 million federal. Long-term debt: $378.3 million.
Spent $425.8 million — $364.8 million to run schools, about $14,789 per student, plus $41.5 million on buildings and equipment. Money in: $149.8 million local (mostly property tax), $323.4 million state, $47.7 million federal. Long-term debt: $276.3 million.
Spent $258 million — $234.4 million to run schools, about $16,832 per student, plus $14.2 million on buildings and equipment. Money in: $75.6 million local (mostly property tax), $178.8 million state, $27.1 million federal. Long-term debt: $141.5 million.
Spent $140.3 million — $128.6 million to run schools, about $14,566 per student, plus $5.5 million on buildings and equipment. Money in: $38.7 million local (mostly property tax), $126.4 million state, $19.8 million federal. Long-term debt: $79.2 million.
Spent $140.9 million — $86.7 million to run schools, about $11,535 per student, plus $43.4 million on buildings and equipment. Money in: $64.9 million local (mostly property tax), $99.8 million state, $2.8 million federal. Long-term debt: $261.1 million.
Spent $52.8 million — $43.1 million to run schools, about $13,060 per student, plus $7.1 million on buildings and equipment. Money in: $16.6 million local (mostly property tax), $51.1 million state, $5.1 million federal. Long-term debt: $30.4 million.
Spent $44.4 million — $40.5 million to run schools, about $13,561 per student, plus $2.9 million on buildings and equipment. Money in: $13.8 million local (mostly property tax), $45.4 million state, $5.4 million federal. Long-term debt: $23.6 million.
And 7 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 High compared with other U.S. counties. FEMA estimates natural hazards cost San Joaquin County about $421.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
655 bridges in San Joaquin County: 220 in good condition, 372 fair, and 63 poor (9.6%). “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.
| INTERSTATE 5 NB over BROOKSIDE CALAVERAS RIV · built 1968 | 124,000 vehicles a day |
| INTERSTATE 5 SB over WEBER PERSHING FREMONT · built 1972 | 113,000 vehicles a day |
| INTERSTATE 5 over MONTE DIABLO AVE · built 1970 | 113,000 vehicles a day |
| INTERSTATE 5 NB over PARADISE CUT UC · built 1971 | 80,000 vehicles a day |
| INTERSTATE 5 NB over WEBER PERSHING FREMONT · built 1972 | 56,500 vehicles a day |
| INTERSTATE 5 NB over MOSHER SLOUGH · built 1975 | 48,000 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $427.5 million of work in San Joaquin County in fiscal 2025, about $549 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 San Joaquin 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 San Joaquin County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Stanislaus County (30 mi) · Sacramento County (36 mi) · Contra Costa County (37 mi) · Alameda County (40 mi) · Calaveras County (43 mi) · Solano County (43 mi).