4,673,096 people (2024 Census estimate, +5.1% since 2020)
9,202 square miles of land · 508 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.
100 active community water systems list Maricopa County in the area they serve, reporting 4,387,249 people served in all (a system that crosses county lines counts its whole population).
| PHOENIX CITY OF surface water · local government · AZ0407025 | 1,695,000 served |
| MESA CITY OF surface water · local government · AZ0407095 | 466,000 served |
| GILBERT, TOWN OF surface water · local government · AZ0407092 | 247,600 served |
| CHANDLER CITY OF surface water · local government · AZ0407090 | 247,328 served |
| SCOTTSDALE CITY OF surface water · local government · AZ0407098 | 241,361 served |
| GLENDALE CITY OF surface water · local government · AZ0407093 | 234,766 served |
| PEORIA CITY OF surface water · local government · AZ0407096 | 187,676 served |
| TEMPE CITY OF surface water · local government · AZ0407100 | 165,000 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 6,937 people were held in Maricopa County's jail, in Vera's latest figure (2024), or 231 per 100,000 residents ages 15–64. In 2019 it was about 7,458.
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.
58 school districts have their office in Maricopa County. School taxes are usually the largest part of a property tax bill.
Spent $846.7 million — $688.9 million to run schools, about $11,808 per student, plus $134.7 million on buildings and equipment. Money in: $278.4 million local (mostly property tax), $401.5 million state, $196.5 million federal. Long-term debt: $312.1 million.
Spent $586.6 million — $481.7 million to run schools, about $11,020 per student, plus $77.7 million on buildings and equipment. Money in: $244.7 million local (mostly property tax), $274.5 million state, $50 million federal. Long-term debt: $359.2 million.
Spent $396.3 million — $360.8 million to run schools, about $9,878 per student, plus $26.3 million on buildings and equipment. Money in: $137 million local (mostly property tax), $251.1 million state, $53.2 million federal. Long-term debt: $167 million.
Spent $449.5 million — $360.4 million to run schools, about $10,830 per student, plus $66.8 million on buildings and equipment. Money in: $171.2 million local (mostly property tax), $214.7 million state, $37.8 million federal. Long-term debt: $134.4 million.
Spent $403 million — $352 million to run schools, about $10,603 per student, plus $42.5 million on buildings and equipment. Money in: $185.8 million local (mostly property tax), $186.7 million state, $48.2 million federal. Long-term debt: $163.9 million.
Spent $410.9 million — $328.9 million to run schools, about $11,781 per student, plus $53.4 million on buildings and equipment. Money in: $248.9 million local (mostly property tax), $123.3 million state, $42.5 million federal. Long-term debt: $322.5 million.
Spent $460.8 million — $371 million to run schools, about $13,297 per student, plus $74.4 million on buildings and equipment. Money in: $287 million local (mostly property tax), $157 million state, $44.5 million federal. Long-term debt: $335.4 million.
Spent $276 million — $241 million to run schools, about $10,402 per student, plus $24.6 million on buildings and equipment. Money in: $107.6 million local (mostly property tax), $158.1 million state, $51 million federal. Long-term debt: $83.6 million.
And 50 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 Maricopa County about $2.2 billion a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
2,854 bridges in Maricopa County: 1,961 in good condition, 889 fair, and 4 poor (0.1%). “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.
| Shea Boulevard over Indian Bend Wash · built 1976 | 37,601 vehicles a day |
| I-8 EB over Gillespie Canal · built 1957 | 6,978 vehicles a day |
| IRR BIA RTE 11 over ARIZONA CANAL · built 1965 | 1,600 vehicles a day |
| IRR BIA RTE 240 over WASH · built 1990 | 566 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $2.7 billion of work in Maricopa County in fiscal 2025, about $616 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. Last day to register to vote: 2026-10-05. Early voting: 2026-10-07 to 2026-10-30. Last day to request a ballot by mail: 2026-10-23. Last suggested day to mail your ballot back: 2026-10-27. Election Day: 2026-11-03.
Source: Arizona Secretary of State, Sept. 4, 2026 · Arizona Secretary of State — 2025–2026 master elections calendar (PDF) · Arizona Secretary of State — election calendar
The budget, property tax rates, audits, local officials and offices for Maricopa 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 Maricopa County built: brayden.ozark@gmail.com.
More of Arizona: the state government and every county in Arizona.
Nearby counties: Pinal County (72 mi) · Yavapai County (89 mi) · Yuma County (90 mi) · La Paz County (93 mi) · Pima County (94 mi) · Gila County (102 mi).