There are 56 cities in Mercer County, Pennsylvania.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hermitage | 1 | 15,816 | 16,243 | -0.67% | 537 | 29.5 | City |
| Sharon | 2 | 12,707 | 13,129 | -0.83% | 3,369 | 3.8 | City |
| Grove City | 3 | 7,747 | 7,875 | -0.41% | 2,874 | 2.7 | Borough |
| Greenville | 4 | 5,467 | 5,534 | -0.31% | 2,897 | 1.9 | Borough |
| Pine township | 5 | 4,692 | 4,794 | -0.76% | 185 | 25.4 | Township |
| Farrell | 6 | 4,129 | 4,253 | -0.74% | 1,824 | 2.3 | City |
| Sharpsville | 7 | 4,113 | 4,248 | -0.82% | 2,957 | 1.4 | Borough |
| Slippery Rock | 8 | 3,716 | 3,168 | 3.83% | 2,259 | 1.6 | Borough |
| Hempfield township | 9 | 3,624 | 3,727 | -0.74% | 256 | 14.2 | Township |
| Shenango township | 10 | 3,410 | 3,516 | -0.93% | 114 | 30.0 | Township |
| West Salem township | 11 | 3,152 | 3,213 | -0.94% | 85 | 36.9 | Township |
| Pymatuning township | 12 | 2,999 | 3,111 | -1.02% | 186 | 16.2 | Township |
| Findley township | 13 | 2,830 | 2,845 | 6.79% | 133 | 21.2 | Township |
| South Pymatuning township | 14 | 2,573 | 2,650 | -0.81% | 131 | 19.6 | Township |
| Lackawannock township | 15 | 2,466 | 2,478 | 0.12% | 118 | 20.9 | Township |
| New Wilmington | 16 | 2,097 | 2,097 | 0% | 1,990 | 1.1 | Borough |
| Coolspring township | 17 | 2,067 | 2,112 | -0.67% | 110 | 18.8 | Township |
| Delaware township | 18 | 2,049 | 2,086 | -0.63% | 63 | 32.7 | Township |
| Mercer | 19 | 1,916 | 1,982 | -0.88% | 1,656 | 1.2 | Borough |
| Jefferson township | 20 | 1,848 | 1,917 | -1.07% | 75 | 24.7 | Township |
| Springfield township | 21 | 1,815 | 1,852 | -0.98% | 66 | 27.3 | Township |
| East Lackawannock township | 22 | 1,642 | 1,670 | -0.55% | 77 | 21.4 | Township |
| Liberty township | 23 | 1,446 | 1,394 | 1.76% | 98 | 14.8 | Township |
| Wilmington township | 24 | 1,415 | 1,407 | 0.5% | 108 | 13.1 | Township |
| Perry township | 25 | 1,290 | 1,331 | -0.85% | 72 | 18.0 | Township |
| Jackson township | 26 | 1,190 | 1,180 | 0.51% | 68 | 17.5 | Township |
| Sandy Lake township | 27 | 1,179 | 1,196 | -0.42% | 48 | 24.4 | Township |
| Cochranton | 28 | 1,092 | 1,118 | -0.64% | 909 | 1.2 | Borough |
| Greene township | 29 | 1,027 | 1,053 | -0.77% | 47 | 21.8 | Township |
| Fairview township | 30 | 933 | 951 | -0.43% | 50 | 18.5 | Township |
| Stoneboro | 31 | 925 | 948 | -0.64% | 326 | 2.8 | Borough |
| Sugar Grove township | 32 | 918 | 951 | -0.97% | 74 | 12.4 | Township |
| Worth township | 33 | 803 | 824 | -0.5% | 33 | 24.7 | Township |
| West Middlesex | 34 | 787 | 815 | -0.88% | 931 | 0.8 | Borough |
| Sandy Creek township | 35 | 781 | 801 | -0.76% | 49 | 15.8 | Township |
| Mill Creek township | 36 | 763 | 775 | -0.39% | 40 | 19.0 | Township |
| Salem township | 37 | 729 | 751 | -0.95% | 55 | 13.4 | Township |
| Wolf Creek township | 38 | 701 | 714 | -0.43% | 41 | 16.9 | Township |
| French Creek township | 39 | 695 | 708 | -0.86% | 34 | 20.7 | Township |
| Lake township | 40 | 686 | 701 | -0.58% | 42 | 16.4 | Township |
| Sandy Lake | 41 | 628 | 648 | -0.79% | 755 | 0.8 | Borough |
| Polk | 42 | 619 | 633 | -0.64% | 305 | 2.0 | Borough |
| Jamestown | 43 | 566 | 581 | -0.7% | 679 | 0.8 | Borough |
| Wheatland | 44 | 564 | 582 | -0.88% | 646 | 0.9 | Borough |
| Clark | 45 | 557 | 575 | -0.89% | 185 | 3.0 | Borough |
| Otter Creek township | 46 | 507 | 524 | -0.98% | 43 | 11.8 | Township |
| New Vernon township | 47 | 479 | 491 | -1.03% | 32 | 14.9 | Township |
| Deer Creek township | 48 | 439 | 453 | -0.9% | 30 | 14.5 | Township |
| Fredonia | 49 | 422 | 434 | -0.71% | 1,182 | 0.4 | Borough |
| West Liberty | 50 | 319 | 333 | -1.24% | 83 | 3.8 | Borough |
| Jackson Center | 51 | 185 | 192 | -1.07% | 163 | 1.1 | Borough |
| New Lebanon | 52 | 185 | 185 | 0% | 145 | 1.3 | Borough |
| Barkeyville | 53 | 183 | 190 | -1.08% | 55 | 3.3 | Borough |
| Utica | 54 | 181 | 187 | -1.09% | 129 | 1.4 | Borough |
| Sheakleyville | 55 | 144 | 150 | -1.37% | 735 | 0.2 | Borough |
| Volant | 56 | 120 | 127 | -1.64% | 1,071 | 0.1 | Borough |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Hermitage is the largest city in Mercer County.
Volant is the smallest city in Mercer County.
There are 56 cities in Mercer County, Pennsylvania.