890,119 people (2024 Census estimate, +3.3% since 2020)
309 square miles of land · 2,878 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 Middlesex County in the area they serve, reporting 720,503 people served in all (a system that crosses county lines counts its whole population).
| MIDDLESEX WATER COMPANY surface water · private · NJ1225001 | 233,376 served |
| OLD BRIDGE MUA buys surface water · local government · NJ1209002 | 68,000 served |
| NEW BRUNSWICK W DEPT surface water · local government · NJ1214001 | 55,000 served |
| PERTH AMBOY WATER DEPARTMENT buys surface water · local government · NJ1216001 | 52,328 served |
| EAST BRUNSWICK WATER UTILITY buys surface water · local government · NJ1204001 | 49,715 served |
| SOUTH BRUNSWICK TWP W DI buys surface water · local government · NJ1221004 | 45,450 served |
| SAYREVILLE W DEPT groundwater (surface-influenced) · local government · NJ1219001 | 45,345 served |
| NORTH BRUNSWICK W DEPT surface water · local government · NJ1215001 | 43,905 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 556 people were held in Middlesex County's jail, in Vera's latest figure (2023), or 98 per 100,000 residents ages 15–64. In 2018 it was about 670.
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.
24 school districts have their office in Middlesex County. School taxes are usually the largest part of a property tax bill.
Spent $363.9 million — $346.5 million to run schools, about $20,618 per student, plus $13.1 million on buildings and equipment. Money in: $244.9 million local (mostly property tax), $120.8 million state, $18.5 million federal. Long-term debt: $500,000.
Spent $379 million — $348.8 million to run schools, about $25,209 per student, plus $19.3 million on buildings and equipment. Money in: $219.9 million local (mostly property tax), $153.4 million state, $25.7 million federal. Long-term debt: $185.5 million.
Spent $479.7 million — $455.1 million to run schools, about $43,413 per student, plus $10.3 million on buildings and equipment. Money in: $31.1 million local (mostly property tax), $261.1 million state, $56.1 million federal.
Spent $302 million — $273.9 million to run schools, about $28,267 per student, plus $4 million on buildings and equipment. Money in: $44.7 million local (mostly property tax), $235.7 million state, $31.1 million federal. Long-term debt: $13.8 million.
Spent $243.4 million — $220.9 million to run schools, about $27,078 per student, plus $15.9 million on buildings and equipment. Money in: $153.3 million local (mostly property tax), $73.7 million state, $12.5 million federal. Long-term debt: $60.6 million.
Spent $205.1 million — $199.7 million to run schools, about $24,666 per student, plus $2 million on buildings and equipment. Money in: $117.1 million local (mostly property tax), $74.3 million state, $11.7 million federal. Long-term debt: $24.1 million.
Spent $195.8 million — $188.2 million to run schools, about $23,676 per student, plus $2.4 million on buildings and equipment. Money in: $130.4 million local (mostly property tax), $64.4 million state, $6.6 million federal. Long-term debt: $25.4 million.
Spent $177.2 million — $161.1 million to run schools, about $21,902 per student, plus $11.3 million on buildings and equipment. Money in: $112.1 million local (mostly property tax), $61 million state, $7.9 million federal. Long-term debt: $3.6 million.
And 16 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 Middlesex County about $282.4 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
563 bridges in Middlesex County: 130 in good condition, 409 fair, and 24 poor (4.3%). “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.
| US 1 over FORRESTAL ROAD · built 1932 | 93,321 vehicles a day |
| US 130 over RIDGE ROAD (CR 522) · built 1941 | 38,155 vehicles a day |
| US RT 130 over CONRAIL JAMESBURG BR · built 1941 | 37,178 vehicles a day |
| CRANBURY RD (535) over NEW JERSEY 18 · built 1963 | 22,324 vehicles a day |
| LANDING LANE (609) over DELAWARE & RARITAN CANAL · built 1920 | 22,262 vehicles a day |
| OAK TREE RD CR 604 over LEHIGH VALLEY LINE · built 1931 | 18,708 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $267.3 million of work in Middlesex County in fiscal 2025, about $310 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.
Registration deadlines, early voting and polling places for New Jersey are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for Middlesex 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 Middlesex County built: brayden.ozark@gmail.com.
More of New Jersey: the state government and every county in New Jersey.
Nearby counties: Somerset County (14 mi) · Union County (16 mi) · Richmond County, NY (16 mi) · Monmouth County (17 mi) · Mercer County (19 mi) · Essex County (25 mi).