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 |
|---|---|---|---|---|---|---|---|
| Hampden township | 1 | 35,938 | 33,032 | 2.91% | 2,082 | 17.3 | Township |
| Upper Allen township | 2 | 24,342 | 23,261 | 1.34% | 1,838 | 13.2 | Township |
| Carlisle | 3 | 23,072 | 20,146 | 3.27% | 4,170 | 5.5 | Borough |
| East Pennsboro township | 4 | 21,200 | 20,915 | 0.1% | 2,011 | 10.5 | Township |
| Lower Allen township | 5 | 19,753 | 20,135 | -3.08% | 1,963 | 10.1 | Township |
| South Middleton township | 6 | 16,904 | 16,168 | 0.61% | 347 | 48.8 | Township |
| North Middleton township | 7 | 12,801 | 12,095 | 1.73% | 552 | 23.2 | Township |
| Mechanicsburg | 8 | 10,103 | 9,335 | 1.94% | 4,190 | 2.4 | Borough |
| Camp Hill | 9 | 8,178 | 8,118 | 0.18% | 3,848 | 2.1 | Borough |
| New Cumberland | 10 | 7,560 | 7,507 | 0.17% | 4,513 | 1.7 | Borough |
| Middlesex township | 11 | 7,202 | 7,052 | 0.24% | 280 | 25.7 | Township |
| Monroe township | 12 | 6,719 | 6,262 | 1.34% | 258 | 26.1 | Township |
| Plainfield township | 13 | 6,220 | 6,243 | -0.02% | 251 | 24.7 | Township |
| West Pennsboro township | 14 | 5,637 | 5,593 | -0.18% | 186 | 30.2 | Township |
| Shippensburg | 15 | 5,630 | 5,484 | 0.64% | 2,776 | 2.0 | Borough |
| Dickinson township | 16 | 5,420 | 5,304 | 0.24% | 118 | 45.8 | Township |
| Lemoyne | 17 | 4,821 | 4,675 | 0.75% | 2,991 | 1.6 | Borough |
| Shippensburg township | 18 | 4,309 | 4,288 | -0.07% | 1,737 | 2.5 | Township |
| Wormleysburg | 19 | 3,072 | 3,052 | 0.16% | 3,954 | 0.8 | Borough |
| North Newton township | 20 | 2,576 | 2,557 | -0.31% | 113 | 22.8 | Township |
| Upper Frankford township | 21 | 2,253 | 2,135 | 1.35% | 116 | 19.4 | Township |
| Mount Holly Springs | 22 | 2,015 | 1,997 | 0.2% | 1,483 | 1.4 | Borough |
| Lower Frankford township | 23 | 1,796 | 1,754 | -0.17% | 122 | 14.7 | Township |
| Lower Mifflin township | 24 | 1,771 | 1,756 | -0.17% | 75 | 23.8 | Township |
| Shiremanstown | 25 | 1,651 | 1,641 | 0.12% | 5,395 | 0.3 | Borough |
| Newville | 26 | 1,388 | 1,374 | 0.22% | 3,313 | 0.4 | Borough |
| South Newton township | 27 | 1,378 | 1,371 | -0.14% | 122 | 11.3 | Township |
| Upper Mifflin township | 28 | 1,362 | 1,317 | 0.59% | 63 | 21.7 | Township |
| Newburg | 29 | 366 | 364 | 0% | 1,978 | 0.2 | Borough |
| Newburg | 30 | 78 | 80 | -1.27% | 42 | 1.8 | 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.
Hampden township is the largest city in Cumberland County.
Newburg is the smallest city in Cumberland County.
There are 30 cities in Cumberland County, Pennsylvania.