20 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 16125 | Greenville | 17,088 |
| 16148 | Hermitage | 16,563 |
| 16127 | Grove City | 15,295 |
| 16146 | Sharon | 13,033 |
| 16137 | Mercer | 12,327 |
| 16150 | Sharpsville | 7,053 |
| 16142 | New Wilmington | 5,433 |
| 16159 | West Middlesex | 4,664 |
| 16121 | Farrell | 4,290 |
| 16145 | Sandy Lake | 2,674 |
| 16154 | Transfer | 2,351 |
| 16153 | Stoneboro | 2,303 |
| 16130 | Hadley | 1,876 |
| 16124 | Fredonia | 1,656 |
| 16133 | Jackson Center | 1,528 |
| 16161 | Wheatland | 703 |
| 16114 | Clarks Mills | 575 |
| 16311 | Carlton | 397 |
| 16113 | Clark | 351 |
| 16151 | Sheakleyville | 57 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 20 ZCTAs in Mercer County, Pennsylvania (US Census).