There are 29 cities in Northumberland 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 | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Sunbury | 1 | Pennsylvania | 9,468 | 9,706 | -0.62% | 4,717 | 2.01 |
| Shamokin | 2 | Pennsylvania | 6,749 | 6,927 | -0.65% | 8,181 | 0.82 |
| Milton | 3 | Pennsylvania | 6,446 | 6,612 | -0.63% | 1,858 | 3.47 |
| Mount Carmel | 4 | Pennsylvania | 5,606 | 5,726 | -0.53% | 8,468 | 0.66 |
| Danville | 5 | Pennsylvania | 4,192 | 4,244 | -0.31% | 2,696 | 1.55 |
| Northumberland | 6 | Pennsylvania | 3,812 | 3,908 | -0.63% | 2,368 | 1.61 |
| Elysburg | 7 | Pennsylvania | 2,681 | 2,147 | 4.48% | 919 | 2.92 |
| Kulpmont | 8 | Pennsylvania | 2,680 | 2,756 | -0.7% | 2,795 | 0.96 |
| Muncy | 9 | Pennsylvania | 2,394 | 2,440 | -0.46% | 2,836 | 0.84 |
| Watsontown | 10 | Pennsylvania | 2,214 | 2,236 | -0.22% | 3,123 | 0.71 |
| Edgewood | 11 | Pennsylvania | 2,201 | 2,616 | -0.54% | 4,384 | 0.50 |
| Riverside | 12 | Pennsylvania | 2,006 | 2,040 | -0.4% | 406 | 4.94 |
| Fairview-Ferndale | 13 | Pennsylvania | 1,831 | 2,047 | -0.16% | 1,986 | 0.92 |
| Trevorton | 14 | Pennsylvania | 1,685 | 1,624 | -0.3% | 395 | 4.26 |
| Dewart | 15 | Pennsylvania | 1,272 | 1,298 | -0.47% | 624 | 2.04 |
| Marshallton | 16 | Pennsylvania | 1,242 | 1,151 | 0.57% | 1,433 | 0.87 |
| Montandon | 17 | Pennsylvania | 812 | 892 | -2.4% | 927 | 0.88 |
| Kapp Heights | 18 | Pennsylvania | 727 | 697 | -2.55% | 2,089 | 0.35 |
| Turbotville | 19 | Pennsylvania | 661 | 677 | -0.6% | 1,466 | 0.45 |
| Marion Heights | 20 | Pennsylvania | 549 | 559 | -0.36% | 3,588 | 0.15 |
| Atlas | 21 | Pennsylvania | 486 | 842 | -15.48% | 1,807 | 0.27 |
| Dalmatia | 22 | Pennsylvania | 375 | 404 | 0.27% | 550 | 0.68 |
| Herndon | 23 | Pennsylvania | 343 | 351 | -0.58% | 434 | 0.79 |
| Snydertown | 24 | Pennsylvania | 318 | 326 | -0.63% | 93 | 3.43 |
| Ranshaw | 25 | Pennsylvania | 298 | 176 | -4.79% | 2,159 | 0.14 |
| McEwensville | 26 | Pennsylvania | 291 | 289 | 0.34% | 2,487 | 0.12 |
| Tharptown (Uniontown) | 27 | Pennsylvania | 168 | 370 | -22.94% | 1,714 | 0.10 |
| Klingerstown | 28 | Pennsylvania | 108 | 96 | 2.86% | 223 | 0.48 |
| Strong | 29 | Pennsylvania | 0 | 193 | 0% | 0 | 0.04 |
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.
Sunbury is the largest city in Northumberland County.
Strong is the smallest city in Northumberland County.
There are 29 cities in Northumberland County, Pennsylvania.