| 16311 Carlton | 814 | Mercer County | Pennsylvania (PA) |
| 16113 Clark | 724/878 | Mercer County | Pennsylvania (PA) |
| 16114 Clarks Mills | 724/878 | Mercer County | Pennsylvania (PA) |
| 16154 Delaware Township | 724/878 | Mercer County | Pennsylvania (PA) |
| 16121 Farrell | 724/878 | Mercer County | Pennsylvania (PA) |
| 16124 Fredonia | 724/878 | Mercer County | Pennsylvania (PA) |
| 16125 Greenville | 724/878 | Mercer County | Pennsylvania (PA) |
| 16127 Grove City | 724/878 | Mercer County | Pennsylvania (PA) |
| 16127 Grove City Postal Retail Str | 724/878 | Mercer County | Pennsylvania (PA) |
| 16130 Hadley | 724/878 | Mercer County | Pennsylvania (PA) |
| 16148 Hermitage | 724/878 | Mercer County | Pennsylvania (PA) |
| 16133 Jackson Center | 724/878 | Mercer County | Pennsylvania (PA) |
| 16134 Jamestown | 724/878 | Mercer County | Pennsylvania (PA) |
| 16137 Mercer | 724/878 | Mercer County | Pennsylvania (PA) |
| 16145 Sandy Lake | 724/878 | Mercer County | Pennsylvania (PA) |
| 16146 Sharon | 724/878 | Mercer County | Pennsylvania (PA) |
| 16148 Sharon | 724/878 | Mercer County | Pennsylvania (PA) |
| 16150 Sharpsville | 724/878 | Mercer County | Pennsylvania (PA) |
| 16151 Sheakleyville | 724/878 | Mercer County | Pennsylvania (PA) |
| 16125 Shenango | 724/878 | Mercer County | Pennsylvania (PA) |
| 16154 South Pymatuning Township | 724/878 | Mercer County | Pennsylvania (PA) |
| 16153 Stoneboro | 724/878 | Mercer County | Pennsylvania (PA) |
| 16154 Transfer | 724/878 | Mercer County | Pennsylvania (PA) |
| 16159 West Middlesex | 724/878 | Mercer County | Pennsylvania (PA) |
| 16134 Westford | 724/878 | Mercer County | Pennsylvania (PA) |
| 16161 Wheatland | 724/878 | Mercer County | Pennsylvania (PA) |