Mercer County, New Jersey ZIP codes
39 ZIP codes are in Mercer County, plus 4 that cross in from neighboring counties. It's part of the Trenton-Princeton, NJ metro area.
- ZIP codes
- 39
- Population in these ZIPs
- 395,671
- Avg. median income
- $113,700population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Mercer County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 08520 | Hightstown | 29,504 | $118,010 | $462,400 |
| 08525 | Hopewell | 4,522 | $165,324 | $659,400 |
| 08534 | Pennington | 13,272 | $175,573 | $669,700 |
| 08540 | Princeton | 50,388 | $176,983 | $963,100 |
| 08541 PO Box | Princeton | — | — | — |
| 08542 | Princeton | 2,533 | $105,524 | $898,200 |
| 08543 PO Box | Princeton | — | — | — |
| 08544 | Princeton | 4,392 | — | — |
| 08550 | Princeton Junction | 21,067 | $224,213 | $1,010,500 |
| 08560 | Titusville | 3,245 | $128,516 | $657,900 |
| 08561 | Windsor | 325 | — | $484,400 |
| 08601 PO Box | Trenton | — | — | — |
| 08602 PO Box | Trenton | — | — | — |
| 08603 PO Box | Trenton | — | — | — |
| 08604 PO Box | Trenton | — | — | — |
| 08605 PO Box | Trenton | — | — | — |
| 08606 PO Box | Trenton | — | — | — |
| 08607 PO Box | Trenton | — | — | — |
| 08608 | Trenton | 1,250 | $61,201 | $132,400 |
| 08609 | Trenton | 15,938 | $68,238 | $207,500 |
| 08610 | Trenton | 33,465 | $83,906 | $349,100 |
| 08611 | Trenton | 31,995 | $56,788 | $194,200 |
| 08618 | Trenton | 35,634 | $50,390 | $268,700 |
| 08619 | Trenton | 24,089 | $105,946 | $429,300 |
| 08620 | Trenton | 11,621 | $105,368 | $460,300 |
| 08625 PO Box | Trenton | — | — | — |
| 08628 | Trenton | 9,831 | $108,158 | $423,000 |
| 08629 | Trenton | 13,013 | $82,646 | $257,600 |
| 08638 | Trenton | 22,816 | $66,875 | $306,200 |
| 08644 PO Box | Trenton | — | — | — |
| 08645 PO Box | Trenton | — | — | — |
| 08646 PO Box | Trenton | — | — | — |
| 08647 PO Box | Trenton | — | — | — |
| 08648 | Lawrence Township | 31,323 | $125,514 | $466,000 |
| 08650 PO Box | Trenton | — | — | — |
| 08666 PO Box | Trenton | — | — | — |
| 08690 | Trenton | 18,841 | $127,339 | $485,300 |
| 08691 | Trenton | 16,607 | $132,520 | $633,400 |
| 08695 PO Box | Trenton | — | — | — |
ZIP codes partly in Mercer County
These ZIP codes are mostly in a neighboring county but cover part of Mercer County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 08501 | Allentown | Monmouth County | 6,364 | $146,182 | $732,500 |
| 08512 | Cranbury | Middlesex County | 12,928 | $118,587 | $749,900 |
| 08530 | Lambertville | Hunterdon County | 8,119 | $120,467 | $637,400 |
| 08558 | Skillman | Somerset County | 7,648 | $236,016 | $1,041,200 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Mercer County
Nearby counties
Frequently asked questions
How many ZIP codes are in Mercer County, New Jersey?
39 ZIP codes are mainly in Mercer County, and 4 more ZIP codes from neighboring areas reach partly into it.
What cities are in Mercer County?
ZIP codes in Mercer County use the city names Hightstown, Hopewell, Lawrence Township, Pennington, Princeton, Princeton Junction, Titusville, Trenton and Windsor.
What metro area is Mercer County in?
Mercer County is part of the Trenton-Princeton, NJ metropolitan statistical area.