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 |
|---|---|---|---|---|---|---|---|
| Lower Paxton township | 1 | 54,943 | 53,722 | 0.25% | 1,951 | 28.2 | Township |
| Harrisburg | 2 | 49,984 | 50,095 | -0.06% | 6,156 | 8.1 | City |
| Middletown township | 3 | 45,577 | 45,990 | -0.13% | 2,413 | 18.9 | Township |
| Swatara township | 4 | 27,663 | 27,837 | -0.45% | 2,120 | 13.0 | Township |
| Middletown township | 5 | 17,152 | 16,343 | 1.64% | 1,273 | 13.5 | Township |
| West Hanover township | 6 | 11,213 | 10,725 | 0.84% | 483 | 23.2 | Township |
| Lower Swatara township | 7 | 9,789 | 9,538 | -0.08% | 796 | 12.3 | Township |
| Middletown | 8 | 9,629 | 9,545 | 0.22% | 4,743 | 2.0 | Borough |
| South Hanover township | 9 | 7,277 | 7,210 | -0.06% | 651 | 11.2 | Township |
| Steelton | 10 | 6,321 | 6,267 | 0.21% | 3,336 | 1.9 | Borough |
| East Hanover township | 11 | 5,957 | 6,020 | -0.37% | 148 | 40.2 | Township |
| Middle Paxton township | 12 | 5,063 | 5,058 | -0.2% | 93 | 54.4 | Township |
| Londonderry township | 13 | 4,881 | 4,898 | -0.06% | 214 | 22.8 | Township |
| Hummelstown | 14 | 4,493 | 4,540 | -0.27% | 3,618 | 1.2 | Borough |
| Upper Paxton township | 15 | 3,983 | 4,010 | -0.35% | 154 | 25.9 | Township |
| Halifax township | 16 | 3,309 | 3,355 | -0.51% | 120 | 27.6 | Township |
| Penbrook | 17 | 3,234 | 3,273 | -0.31% | 7,235 | 0.4 | Borough |
| Conewago township | 18 | 3,020 | 2,959 | 0.37% | 180 | 16.7 | Township |
| Highspire | 19 | 2,704 | 2,739 | -0.33% | 3,761 | 0.7 | Borough |
| Millersburg | 20 | 2,514 | 2,544 | -0.32% | 3,312 | 0.8 | Borough |
| Lykens | 21 | 1,852 | 1,871 | -0.27% | 1,518 | 1.2 | Borough |
| Paxtang | 22 | 1,623 | 1,642 | -0.31% | 3,998 | 0.4 | Borough |
| Lykens township | 23 | 1,579 | 1,561 | -0.06% | 60 | 26.5 | Township |
| Elizabethville | 24 | 1,336 | 1,350 | -0.3% | 2,442 | 0.5 | Borough |
| Williamstown | 25 | 1,289 | 1,304 | -0.31% | 4,977 | 0.3 | Borough |
| Wiconisco township | 26 | 1,150 | 1,167 | -0.52% | 118 | 9.8 | Township |
| Royalton | 27 | 1,124 | 1,135 | -0.27% | 3,535 | 0.3 | Borough |
| Williams township | 28 | 1,051 | 1,064 | -0.47% | 119 | 8.8 | Township |
| Halifax | 29 | 807 | 797 | 0.25% | 2,402 | 0.3 | Borough |
| Dauphin | 30 | 788 | 796 | -0.25% | 1,841 | 0.4 | Borough |
| Gratz | 31 | 730 | 741 | -0.41% | 248 | 2.9 | Borough |
| Berrysburg | 32 | 322 | 325 | -0.31% | 531 | 0.6 | Borough |
| Pillow | 33 | 288 | 291 | -0.35% | 584 | 0.5 | 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.
Lower Paxton township is the largest city in Dauphin County.
Pillow is the smallest city in Dauphin County.
There are 33 cities in Dauphin County, Pennsylvania.