Middlesex County, New Jersey
Middlesex County is a county in New Jersey. Its county FIPS code is 34023. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 34023
- Representative coordinates
- 40.439621, -74.407430
- County type
- County
- County seat or government
- New Brunswick
- Resident population, July 2025
- 883,335
- Land area
- 801.118 km²
- Water area
- 35.127 km²
- State
- New Jersey
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in Middlesex County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/New_York | UTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
07001 · 07008 · 07060 · 07063 · 07064 · 07067 · 07077 · 07080 · 07095 · 07721 · 07726 · 07735 · 07747 · 08512 · 08528 · 08536 · 08540 · 08810 · 08812 · 08816 · 08817 · 08820 · 08824 · 08828 · 08830 · 08831 · 08832 · 08837 · 08840 · 08846 · 08850 · 08852 · 08854 · 08857 · 08859 · 08861 · 08863 · 08872 · 08879 · 08882 · 08884 · 08901 · 08902 · 08904
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Avenel CDP, NJ
- Brownville CDP, NJ
- Carteret borough, NJ
- Clearbrook CDP, NJ
- Colonia CDP, NJ
- Concordia CDP, NJ
- Cranbury CDP, NJ
- Dayton CDP, NJ
- Deans CDP, NJ
- Dunellen borough, NJ
- Encore at Monroe CDP, NJ
- Fords CDP, NJ
- Forsgate CDP, NJ
- Heathcote CDP, NJ
- Helmetta borough, NJ
- Highland Park borough, NJ
- Hopelawn CDP, NJ
- Iselin CDP, NJ
- Jamesburg borough, NJ
- Keasbey CDP, NJ
- Kendall Park CDP, NJ
- Kingston CDP, NJ
- Laurence Harbor CDP, NJ
- Madison Park CDP, NJ
- Menlo Park Terrace CDP, NJ
- Metuchen borough, NJ
- Middlesex borough, NJ
- Milltown borough, NJ
- Monmouth Junction CDP, NJ
- Monroe Manor CDP, NJ
Browse all cities, towns and communities for Middlesex County
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
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