44 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Williamsport | 1 | 27,292 | 27,737 | -0.33% | 3,109 | 8.78 | City |
| Montgomery township | 2 | 25,968 | 25,866 | -0.1% | 2,443 | 10.63 | Township |
| Loyalsock township | 3 | 11,313 | 11,556 | -0.4% | 536 | 21.11 | Township |
| South Williamsport | 4 | 6,106 | 6,256 | -0.49% | 3,215 | 1.90 | Borough |
| Montgomery township | 5 | 5,856 | 5,738 | 0.6% | 87 | 67.36 | Township |
| Old Lycoming township | 6 | 4,892 | 4,976 | -0.37% | 521 | 9.38 | Township |
| Kenmar | 7 | 4,850 | 3,895 | 1% | 2,368 | 2.05 | CDP |
| Montoursville | 8 | 4,614 | 4,744 | -0.56% | 1,270 | 3.63 | Borough |
| Jersey Shore | 9 | 4,040 | 4,157 | -0.57% | 3,489 | 1.16 | Borough |
| Muncy Creek township | 10 | 3,559 | 3,569 | 0.25% | 178 | 20.03 | Township |
| Wolf township | 11 | 3,106 | 3,109 | 0.16% | 158 | 19.63 | Township |
| Garden View | 12 | 2,690 | 2,757 | 0.45% | 2,486 | 1.08 | CDP |
| Hepburn township | 13 | 2,535 | 2,579 | -0.28% | 152 | 16.67 | Township |
| Muncy | 14 | 2,370 | 2,439 | -0.59% | 2,808 | 0.84 | Borough |
| Hughesville | 15 | 2,092 | 2,152 | -0.57% | 3,243 | 0.65 | Borough |
| Upper Fairfield township | 16 | 1,763 | 1,808 | -0.62% | 98 | 17.96 | Township |
| Montgomery | 17 | 1,525 | 1,569 | -0.59% | 2,788 | 0.55 | Borough |
| Porter township | 18 | 1,504 | 1,533 | -0.33% | 198 | 7.61 | Township |
| Lycoming township | 19 | 1,469 | 1,491 | -0.34% | 97 | 15.18 | Township |
| Montgomery township | 20 | 1,421 | 1,420 | 0.14% | 50 | 28.66 | Township |
| Muncy township | 21 | 1,197 | 1,175 | 0.59% | 77 | 15.48 | Township |
| Duboistown | 22 | 1,161 | 1,195 | -0.6% | 2,103 | 0.55 | Borough |
| Faxon | 23 | 1,028 | 1,305 | -2.28% | 2,173 | 0.47 | CDP |
| Piatt township | 24 | 1,019 | 1,046 | -0.59% | 104 | 9.77 | Township |
| Moreland township | 25 | 1,002 | 1,020 | -0.4% | 42 | 23.91 | Township |
| Cogan House township | 26 | 919 | 933 | -0.22% | 13 | 69.92 | Township |
| Lewis township | 27 | 846 | 859 | -0.35% | 23 | 37.09 | Township |
| Anthony township | 28 | 843 | 864 | -0.47% | 54 | 15.56 | Township |
| Jordan township | 29 | 827 | 849 | -0.6% | 40 | 20.89 | Township |
| Gamble township | 30 | 798 | 779 | 0.88% | 18 | 44.96 | Township |
| Armstrong township | 31 | 669 | 688 | -0.45% | 27 | 24.74 | Township |
| Nippenose township | 32 | 652 | 660 | 0% | 59 | 10.98 | Township |
| Picture Rocks | 33 | 623 | 640 | -0.48% | 640 | 0.97 | Borough |
| Plunketts Creek township | 34 | 583 | 596 | -0.34% | 11 | 53.55 | Township |
| Watson township | 35 | 523 | 534 | -0.57% | 23 | 23.13 | Township |
| Bastress township | 36 | 516 | 528 | -0.39% | 55 | 9.42 | Township |
| Brady township | 37 | 490 | 502 | -0.41% | 55 | 8.84 | Township |
| McIntyre township | 38 | 450 | 461 | -0.44% | 10 | 46.60 | Township |
| Cascade township | 39 | 411 | 420 | -0.48% | 10 | 39.20 | Township |
| Cummings township | 40 | 263 | 264 | 0% | 4 | 69.42 | Township |
| Pine township | 41 | 258 | 261 | 0% | 3 | 74.74 | Township |
| McNett township | 42 | 147 | 146 | 0.68% | 4 | 33.55 | Township |
| McHenry township | 43 | 117 | 121 | -0.85% | 2 | 76.23 | Township |
| Brown township | 44 | 91 | 92 | 0% | 1 | 73.34 | Township |
Williamsport is the largest city in Lycoming County, with a population of 27,292.
Brown township is the smallest city in Lycoming County.
There are 44 cities in Lycoming County, Pennsylvania.