Buying in Middlesex County, New Jersey

Middlesex County at a glance

Middlesex County is one of 21 counties and county-equivalents in New Jersey. Its county seat is New Brunswick. County government publishes its offices and parcel tools online. Official county website. With a 2024 Census Bureau population estimate of 890,119, it is the second most populous county in New Jersey. In the FBI's 2024 reported-crime file, agencies here reported 12,463 offenses — 14.0 per 1,000 residents; the breakdown is below.

Records to check before you buy in Middlesex County

• Property record card — the Middlesex County assessor / appraisal office. Pull the parcel's assessed-value history, exemption status, and last sale. This is the file your future tax bill is calculated from, and it shows whether the current owner is enjoying exemptions you will not inherit. County government sits in New Brunswick; the official county website is the reliable route to the parcel search and the office directory.
• Deeds & liens — the Middlesex County recorder / land-records office. Read the deed chain, open liens, easements, and plat maps — the file a listing never mentions.
• Official flood determination. Check the exact parcel on FEMA's National Flood Hazard Layer — not the listing site's licensed model. Zone boundaries cut through streets; the house next door can be in a different zone. Middlesex County is the primary county for 36 ZIP codes in the Census Bureau's ZIP-to-county crosswalk — and zone lines ignore every one of them.
• The county's reported-crime record. In the FBI's 2024 file, agencies in Middlesex County reported 12,463 offenses — 14.0 per 1,000 residents; the largest single category was larceny-theft (8,909). The crime section below sets that beside the New Jersey county median.
• Registry check. Run the address through New Jersey Sex Offender Internet Registry (New Jersey State Police) and note the counts within a mile — then check again the week you close.
• Permits & code history — the Middlesex building department. Open permits, expired permits, and code cases tell you whether the renovation in the photos was ever inspected. County permitting is run out of New Brunswick.
• School assignment — the district office, not the listing. Only the district's own boundary lookup confirms which school an address is actually zoned for.

County list, land area and population: U.S. Census Bureau (population: 2024 PEP estimate). County seat and official website: Wikidata (CC0), checked 2026-11-04. Flood determinations: FEMA. Registry: New Jersey.

Reported crime in Middlesex County — FBI 2024

Reported crime in Middlesex County in 2024 was overwhelmingly property crime: agencies logged 12,463 offenses, of which 10,878 were property offenses and 1,585 violent. The total rate is 14.0 per 1,000 residents (violent 178.1, property 1222.1 per 100,000).

Inside New Jersey, the median county in the same file recorded a violent-crime rate of 178 per 100,000 and a property-crime rate of 1,222 per 100,000 (medians computed from the FBI 2024 county file across 21 counties).

The largest reported categories were larceny-theft (8,909), burglary (1,134) and aggravated assault (1,105).

Coverage: 31 of 31 law-enforcement agencies assigned to this county reported at least one month of 2024 offense data to the FBI; 29 reported all 12 months. Counts are reported offenses only (FBI Return A / Arson master files), assigned whole to each agency's primary county; they are not adjusted for non-reporting agencies.

These are offenses reported to law enforcement — not convictions, and not a verdict on any street or address. A CurbFacts report pairs this county record with the ZIP-level picture for the specific address you are buying.

Source: FBI Crime Data Explorer, UCR Return A + Arson master files, data year 2024 (pulled 2026-11-04).

The New Jersey rules that apply in Middlesex County

Traps researched for New Jersey buyers: Flood disclosure is mandatory and FEMA-zone specific since March 20, 2024; Mansion tax is now a graduated seller-paid fee over $1 million.

Read the full New Jersey guide — disclosure standard, tax math, registry and flood

More New Jersey counties

All New Jersey counties · New Jersey buyer guide