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 |
|---|---|---|---|---|---|---|---|
| Williamsport | 1 | 27,381 | 27,737 | -0.32% | 3,120 | 8.8 | City |
| Montgomery township | 2 | 25,993 | 25,866 | -0.1% | 2,445 | 10.6 | Township |
| Loyalsock township | 3 | 11,358 | 11,556 | -0.4% | 538 | 21.1 | Township |
| South Williamsport | 4 | 6,136 | 6,256 | -0.49% | 3,231 | 1.9 | Borough |
| Montgomery township | 5 | 5,821 | 5,738 | 0.6% | 86 | 67.4 | Township |
| Old Lycoming township | 6 | 4,910 | 4,976 | -0.36% | 523 | 9.4 | Township |
| Montoursville | 7 | 4,640 | 4,744 | -0.56% | 1,277 | 3.6 | Borough |
| Jersey Shore | 8 | 4,063 | 4,157 | -0.59% | 3,509 | 1.2 | Borough |
| Muncy Creek township | 9 | 3,550 | 3,569 | 0.25% | 177 | 20.0 | Township |
| Wolf township | 10 | 3,101 | 3,109 | 0.16% | 158 | 19.6 | Township |
| Hepburn township | 11 | 2,542 | 2,579 | -0.27% | 153 | 16.7 | Township |
| Muncy | 12 | 2,384 | 2,439 | -0.58% | 2,825 | 0.8 | Borough |
| Hughesville | 13 | 2,104 | 2,152 | -0.57% | 3,262 | 0.6 | Borough |
| Upper Fairfield township | 14 | 1,774 | 1,808 | -0.62% | 99 | 18.0 | Township |
| Montgomery | 15 | 1,534 | 1,569 | -0.58% | 2,804 | 0.5 | Borough |
| Porter township | 16 | 1,509 | 1,533 | -0.33% | 198 | 7.6 | Township |
| Lycoming township | 17 | 1,474 | 1,491 | -0.34% | 97 | 15.2 | Township |
| Montgomery township | 18 | 1,419 | 1,420 | 0.14% | 50 | 28.7 | Township |
| Muncy township | 19 | 1,190 | 1,175 | 0.59% | 77 | 15.5 | Township |
| Duboistown | 20 | 1,168 | 1,195 | -0.6% | 2,116 | 0.6 | Borough |
| Piatt township | 21 | 1,025 | 1,046 | -0.58% | 105 | 9.8 | Township |
| Moreland township | 22 | 1,006 | 1,020 | -0.4% | 42 | 23.9 | Township |
| Picture Rocks | 23 | 626 | 640 | -0.64% | 643 | 1.0 | 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.
Williamsport is the largest city in Lycoming County.
Picture Rocks is the smallest city in Lycoming County.
There are 23 cities in Lycoming County, Pennsylvania.