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 |
| Neshannock township | 2 | 9,629 | 9,837 | -0.41% | 558 | 17.3 | Township |
| Ellwood City | 3 | 7,397 | 7,624 | -0.77% | 3,183 | 2.3 | Borough |
| Shenango township | 4 | 6,980 | 7,125 | -0.46% | 286 | 24.4 | Township |
| Union township | 5 | 4,860 | 4,985 | -0.47% | 510 | 9.5 | Township |
| North Beaver township | 6 | 3,949 | 3,957 | 0.15% | 93 | 42.4 | Township |
| Pulaski township | 7 | 3,029 | 3,094 | -0.3% | 99 | 30.7 | Township |
| Wilmington township | 8 | 2,642 | 2,663 | -0.04% | 134 | 19.7 | Township |
| Mahoning township | 9 | 2,628 | 2,705 | -0.6% | 110 | 23.9 | Township |
| Scott township | 10 | 2,135 | 2,171 | -0.51% | 108 | 19.7 | Township |
| New Wilmington | 11 | 2,097 | 2,097 | 0% | 1,990 | 1.1 | Borough |
| Perry township | 12 | 1,811 | 1,851 | -0.44% | 99 | 18.3 | Township |
| Pulaski township | 13 | 1,260 | 1,292 | -0.32% | 1,733 | 0.7 | Township |
| Little Beaver township | 14 | 1,198 | 1,224 | -0.33% | 59 | 20.4 | Township |
| Bessemer | 15 | 1,039 | 1,073 | -0.86% | 628 | 1.7 | Borough |
| South New Castle | 16 | 629 | 648 | -0.79% | 1,941 | 0.3 | Borough |
| Wampum | 17 | 542 | 556 | -0.73% | 550 | 1.0 | Borough |
| Enon Valley | 18 | 291 | 301 | -1.02% | 595 | 0.5 | Borough |
| Volant | 19 | 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.
New Castle is the largest city in Lawrence County.
Volant is the smallest city in Lawrence County.
There are 19 cities in Lawrence County, Pennsylvania.