42 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hampden township | 1 | 36,955 | 33,032 | 2.83% | 2,141 | 17.26 | Township |
| Upper Allen township | 2 | 24,664 | 23,261 | 1.32% | 1,862 | 13.25 | Township |
| Carlisle | 3 | 23,804 | 20,146 | 3.17% | 4,302 | 5.53 | Borough |
| East Pennsboro township | 4 | 21,222 | 20,915 | 0.1% | 2,013 | 10.54 | Township |
| Lower Allen township | 5 | 19,126 | 20,135 | -3.17% | 1,901 | 10.06 | Township |
| South Middleton township | 6 | 17,006 | 16,168 | 0.6% | 349 | 48.75 | Township |
| North Middleton township | 7 | 13,019 | 12,095 | 1.7% | 561 | 23.19 | Township |
| Mechanicsburg | 8 | 10,295 | 9,335 | 1.9% | 4,270 | 2.41 | Borough |
| Camp Hill | 9 | 8,193 | 8,118 | 0.18% | 3,856 | 2.13 | Borough |
| New Cumberland | 10 | 7,573 | 7,507 | 0.17% | 4,521 | 1.68 | Borough |
| Lower Allen | 11 | 7,514 | 7,132 | 0.74% | 3,420 | 2.20 | CDP |
| Middlesex township | 12 | 7,219 | 7,052 | 0.24% | 281 | 25.69 | Township |
| Monroe township | 13 | 6,808 | 6,262 | 1.32% | 261 | 26.05 | Township |
| Plainfield township | 14 | 6,219 | 6,243 | -0.02% | 251 | 24.74 | Township |
| Enola | 15 | 5,955 | 5,980 | -0.17% | 3,701 | 1.61 | CDP |
| Schlusser | 16 | 5,840 | 5,927 | 0.65% | 1,696 | 3.44 | CDP |
| Shippensburg | 17 | 5,667 | 5,484 | 0.66% | 2,794 | 2.03 | Borough |
| West Pennsboro township | 18 | 5,627 | 5,593 | -0.18% | 186 | 30.23 | Township |
| Dickinson township | 19 | 5,433 | 5,304 | 0.24% | 119 | 45.80 | Township |
| Lemoyne | 20 | 4,858 | 4,675 | 0.77% | 3,014 | 1.61 | Borough |
| Shippensburg township | 21 | 4,306 | 4,288 | -0.07% | 1,736 | 2.48 | Township |
| Boiling Springs | 22 | 3,674 | 3,107 | 0.82% | 1,488 | 2.47 | CDP |
| Wormleysburg | 23 | 3,077 | 3,052 | 0.16% | 3,960 | 0.78 | Borough |
| North Newton township | 24 | 2,568 | 2,557 | -0.31% | 113 | 22.77 | Township |
| Upper Frankford township | 25 | 2,283 | 2,135 | 1.33% | 118 | 19.43 | Township |
| Mount Holly Springs | 26 | 2,020 | 1,997 | 0.25% | 1,486 | 1.36 | Borough |
| Lower Frankford township | 27 | 1,793 | 1,754 | -0.17% | 122 | 14.68 | Township |
| Lower Mifflin township | 28 | 1,768 | 1,756 | -0.17% | 74 | 23.77 | Township |
| Shippensburg University | 29 | 1,749 | 1,887 | -3.21% | 6,269 | 0.28 | CDP |
| Shiremanstown | 30 | 1,654 | 1,641 | 0.18% | 5,405 | 0.31 | Borough |
| Newville | 31 | 1,392 | 1,374 | 0.29% | 3,322 | 0.42 | Borough |
| South Newton township | 32 | 1,376 | 1,371 | -0.15% | 122 | 11.32 | Township |
| Upper Mifflin township | 33 | 1,370 | 1,317 | 0.59% | 63 | 21.72 | Township |
| West Fairview | 34 | 1,242 | 1,244 | -0.24% | 3,857 | 0.32 | CDP |
| New Market | 35 | 1,020 | 743 | 1.39% | 5,426 | 0.19 | CDP |
| New Kingstown | 36 | 770 | 804 | 2.39% | 483 | 1.59 | CDP |
| Carlisle Barracks | 37 | 729 | 963 | 7.21% | 2,163 | 0.34 | CDP |
| Newburg | 38 | 367 | 364 | 0.27% | 1,984 | 0.18 | Borough |
| Newburg | 39 | 284 | 273 | 7.17% | 1,587 | 0.18 | CDP |
| Plainfield | 40 | 203 | 278 | -6.02% | 314 | 0.65 | CDP |
| Cooke township | 41 | 201 | 202 | -0.5% | 10 | 19.79 | Township |
| Newburg | 42 | 78 | 80 | 0% | 42 | 1.84 | Borough |
Hampden township is the largest city in Cumberland County, with a population of 36,955.
Newburg is the smallest city in Cumberland County.
There are 42 cities in Cumberland County, Pennsylvania.