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 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| New Castle | 1 | 21,250 | 21,902 | -0.76% | 2,558 | 8.3 | City |
| Hermitage | 2 | 15,816 | 16,243 | -0.67% | 537 | 29.5 | City |
| Neshannock township | 3 | 9,629 | 9,837 | -0.41% | 558 | 17.3 | Township |
| Grove City | 4 | 7,747 | 7,875 | -0.41% | 2,874 | 2.7 | Borough |
| Ellwood City | 5 | 7,397 | 7,624 | -0.77% | 3,183 | 2.3 | Borough |
| Shenango township | 6 | 6,980 | 7,125 | -0.46% | 286 | 24.4 | Township |
| Union township | 7 | 4,860 | 4,985 | -0.47% | 510 | 9.5 | Township |
| North Beaver township | 8 | 3,949 | 3,957 | 0.15% | 93 | 42.4 | Township |
| Slippery Rock | 9 | 3,716 | 3,168 | 3.83% | 2,259 | 1.6 | Borough |
| Pulaski township | 10 | 3,029 | 3,094 | -0.3% | 99 | 30.7 | Township |
| Slippery Rock township | 11 | 2,873 | 2,912 | -0.21% | 97 | 29.7 | Township |
| Wilmington township | 12 | 2,642 | 2,663 | -0.04% | 134 | 19.7 | Township |
| Mahoning township | 13 | 2,628 | 2,705 | -0.6% | 110 | 23.9 | Township |
| Wayne township | 14 | 2,409 | 2,461 | -0.37% | 149 | 16.1 | Township |
| Hickory township | 15 | 2,286 | 2,316 | -0.04% | 144 | 15.8 | Township |
| Scott township | 16 | 2,135 | 2,171 | -0.51% | 108 | 19.7 | Township |
| New Wilmington | 17 | 2,097 | 2,097 | 0% | 1,990 | 1.1 | Borough |
| Big Beaver | 18 | 1,826 | 1,868 | -0.6% | 103 | 17.8 | Borough |
| Perry township | 19 | 1,811 | 1,851 | -0.44% | 99 | 18.3 | Township |
| New Beaver | 20 | 1,334 | 1,369 | -0.67% | 92 | 14.4 | Borough |
| Little Beaver township | 21 | 1,198 | 1,224 | -0.33% | 59 | 20.4 | Township |
| Ellport | 22 | 1,094 | 1,081 | 0.27% | 2,550 | 0.4 | Borough |
| Bessemer | 23 | 1,039 | 1,073 | -0.86% | 628 | 1.7 | Borough |
| Harmony | 24 | 918 | 950 | -0.86% | 2,330 | 0.4 | Borough |
| West Middlesex | 25 | 787 | 815 | -0.88% | 931 | 0.8 | Borough |
| South New Castle | 26 | 629 | 648 | -0.79% | 1,941 | 0.3 | Borough |
| Wheatland | 27 | 564 | 582 | -0.88% | 646 | 0.9 | Borough |
| Wampum | 28 | 542 | 556 | -0.73% | 550 | 1.0 | Borough |
| West Liberty | 29 | 319 | 333 | -1.24% | 83 | 3.8 | Borough |
| New Galilee | 30 | 315 | 326 | -0.94% | 1,137 | 0.3 | Borough |
| Enon Valley | 31 | 291 | 301 | -1.02% | 595 | 0.5 | Borough |
| Portersville | 32 | 221 | 231 | -1.34% | 278 | 0.8 | Borough |
| Barkeyville | 33 | 183 | 190 | -1.08% | 55 | 3.3 | Borough |
| Volant | 34 | 120 | 127 | -1.64% | 1,071 | 0.1 | Borough |
| Homewood | 35 | 88 | 91 | -1.12% | 521 | 0.2 | Borough |
| S.N.P.J. | 36 | 17 | 17 | 0% | 23 | 0.7 | 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.
New Castle is the largest city in Lawrence County.
S.N.P.J. is the smallest city in Lawrence County.
There are 36 cities in Lawrence County, Pennsylvania.