2,838,461 people (2024 Census estimate, +5.3% since 2020)
1,900 square miles of land · 1,494 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.
25 active community water systems list Miami-Dade County in the area they serve, reporting 3,286,862 people served in all (a system that crosses county lines counts its whole population).
| MDWASA - MAIN SYSTEM groundwater · local government · FL4130871 | 2,377,460 served |
| HIALEAH, CITY OF groundwater · local government · FL4130604 | 238,000 served |
| NORTH MIAMI BEACH groundwater · local government · FL4131618 | 180,000 served |
| MIAMI BEACH, CITY OF buys groundwater · local government · FL4130901 | 100,000 served |
| NORTH MIAMI, CITY OF groundwater · local government · FL4130977 | 89,349 served |
| FKAA J. ROBERT DEAN W.T.P. groundwater · state · FL4134357 | 86,000 served |
| HOMESTEAD, CITY OF groundwater · local government · FL4130645 | 80,000 served |
| MDWASA/REX UTILITIES groundwater · local government · FL4131202 | 45,200 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 4,454 people were held in Miami-Dade County's jail, in Vera's latest figure (2026). In 2021 it was about 4,108.
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.
1 school district has its office in Miami-Dade County. School taxes are usually the largest part of a property tax bill.
Spent $4.9 billion — $4.4 billion to run schools, about $13,138 per student, plus $237.5 million on buildings and equipment. Money in: $2.8 billion local (mostly property tax), $1.1 billion state, $962.2 million federal. Long-term debt: $3 billion.
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 Miami-Dade County about $824.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
1,056 bridges in Miami-Dade County: 732 in good condition, 269 fair, and 55 poor (5.2%). “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.
| I-195 (SR-112) over SR-5 & FEC R/R · built 1961 | 151,500 vehicles a day |
| WB NW 25th St. over North Line Canal · built 2016 | 48,400 vehicles a day |
| COMP SR-112 over INDIAN CREEK CANAL · built 1953 | 41,000 vehicles a day |
| SW 117th Ave. over Town and Country Lake · built 1985 | 39,107 vehicles a day |
| SW 42nd Avenue over Coral Gables Canal · built 1943 | 34,503 vehicles a day |
| Rickenbacker Cswy. over Biscayne Bay/Bear Cut · built 1944 | 30,804 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $1.2 billion of work in Miami-Dade County in fiscal 2025, about $451 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. Vote-by-mail request due by 5 pm: 2026-10-22. Early voting — the statewide minimum: 2026-10-24 to 2026-10-31. Election Day — and mail ballots must arrive: 2026-11-03.
Source: Florida Division of Elections — election dates · WPTV, 2026 deadlines · Florida Division of Elections — early voting
The budget, property tax rates, audits, local officials and offices for Miami-Dade 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 Miami-Dade County built: brayden.ozark@gmail.com.
More of Florida: the state government and every county in Florida.
Nearby counties: Monroe County (32 mi) · Broward County (40 mi) · Collier County (66 mi) · Palm Beach County (71 mi) · Hendry County (75 mi) · Martin County (101 mi).