1,649,060 people (2024 Census estimate, −1.9% since 2020)
737 square miles of land · 2,236 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.
14 active community water systems list Alameda County in the area they serve, reporting 2,251,680 people served in all (a system that crosses county lines counts its whole population).
| EAST BAY MUD surface water · local government · CA0110005 | 1,468,000 served |
| ALAMEDA COUNTY WATER DISTRICT surface water · local government · CA0110001 | 344,000 served |
| CITY OF HAYWARD buys surface water · local government · CA0110006 | 162,954 served |
| DUBLIN SAN RAMON SERVICES DISTRICT buys surface water · local government · CA0110009 | 98,776 served |
| CITY OF PLEASANTON buys surface water · local government · CA0110008 | 76,689 served |
| CALIFORNIA WATER SERVICE - LIVERMORE buys surface water · private · CA0110003 | 60,414 served |
| CITY OF LIVERMORE buys surface water · local government · CA0110011 | 38,892 served |
| ALAMEDA POINT buys surface water · local government · CA0110016 | 600 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 1,449 people were held in Alameda County's jail, in Vera's latest figure (2025). In 2020 it was about 2,048.
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.
20 school districts have their office in Alameda County. School taxes are usually the largest part of a property tax bill.
Spent $983.4 million — $755.1 million to run schools, about $22,112 per student, plus $74.7 million on buildings and equipment. Money in: $404.7 million local (mostly property tax), $541.3 million state, $141.3 million federal. Long-term debt: $11.2 billion.
Spent $633.1 million — $501.6 million to run schools, about $15,152 per student, plus $83.2 million on buildings and equipment. Money in: $248.7 million local (mostly property tax), $349.3 million state, $29.9 million federal. Long-term debt: $696.9 million.
Spent $467.2 million — $353.7 million to run schools, about $19,658 per student, plus $74.9 million on buildings and equipment. Money in: $159.4 million local (mostly property tax), $248.9 million state, $43.2 million federal. Long-term debt: $756.1 million.
Spent $335.4 million — $224.4 million to run schools, about $16,170 per student, plus $79.2 million on buildings and equipment. Money in: $127.4 million local (mostly property tax), $142.7 million state, $9.2 million federal. Long-term debt: $195.9 million.
Spent $237.9 million — $199.6 million to run schools, about $15,408 per student, plus $26.4 million on buildings and equipment. Money in: $121.8 million local (mostly property tax), $130.2 million state, $9.7 million federal. Long-term debt: $253.4 million.
Spent $350.7 million — $190.6 million to run schools, about $15,177 per student, plus $134.9 million on buildings and equipment. Money in: $143.6 million local (mostly property tax), $94.4 million state, $5.9 million federal. Long-term debt: $654.2 million.
Spent $216.6 million — $198.5 million to run schools, about $16,422 per student, plus $9.6 million on buildings and equipment. Money in: $92.4 million local (mostly property tax), $130.2 million state, $25.2 million federal. Long-term debt: $201.1 million.
Spent $187.4 million — $155.2 million to run schools, about $15,166 per student, plus $11.1 million on buildings and equipment. Money in: $82.8 million local (mostly property tax), $119.8 million state, $10.8 million federal. Long-term debt: $305.8 million.
And 12 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: Very High compared with other U.S. counties. FEMA estimates natural hazards cost Alameda County about $1.9 billion a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
662 bridges in Alameda County: 264 in good condition, 356 fair, and 42 poor (6.3%). “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 880 over CRANDALL CREEK · built 1958 | 225,000 vehicles a day |
| INTERSTATE 880 over PATTERSON SLOUGH · built 1957 | 198,000 vehicles a day |
| INTERSTATE 680 over STATE ROUTE 84 SB & OFF · built 1967 | 142,000 vehicles a day |
| INTERSTATE 680 over BERNAL AVE · built 1967 | 136,000 vehicles a day |
| INTERSTATE 680 over HAPPY VALLEY ROAD · built 1967 | 124,000 vehicles a day |
| INTERSTATE 680 over PLEASANTON-SUNOL ROAD · built 1967 | 122,000 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $1.3 billion of work in Alameda County in fiscal 2025, about $788 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 Alameda 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 Alameda County built: brayden.ozark@gmail.com.
More of California: the state government and every county in California.
Nearby counties: Contra Costa County (19 mi) · San Mateo County (30 mi) · Santa Clara County (32 mi) · San Joaquin County (40 mi) · Solano County (43 mi) · Santa Cruz County (44 mi).