Mercer County, New Jersey
22 ZIP codes · 224.48 sq mi of land · FIPS 34021
| Population | 385,864 |
|---|---|
| State | New Jersey |
| FIPS code | 34021 |
| Time zone | Eastern |
| Land area | 224.48 sq mi |
| Center (lat, long) | 40.2825, -74.7037 |
Area codes in this area
These are the area codes that most often serve Mercer County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Cities and towns (largest first)
Trenton · 90,338Princeton · 30,756HightstownHopewellPenningtonPrinceton JunctionTitusvilleWindsorLawrence Township
ZIP codes in Mercer County
08520 Hightstown08525 Hopewell08534 Pennington08540 Princeton08542 Princeton08544 Princeton08550 Princeton Junction08560 Titusville08561 Windsor08608 Trenton08609 Trenton08610 Trenton08611 Trenton08618 Trenton08619 Trenton08620 Trenton08628 Trenton08629 Trenton08638 Trenton08648 Lawrence Township08690 Trenton08691 Trenton
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.