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 |
|---|---|---|---|---|---|---|---|
| Gettysburg | 1 | 8,921 | 7,107 | 5.35% | 5,374 | 1.7 | Borough |
| Conewago township | 2 | 8,058 | 7,867 | 0.78% | 774 | 10.4 | Township |
| Cumberland township | 3 | 7,191 | 7,027 | 0.74% | 215 | 33.4 | Township |
| Straban township | 4 | 4,966 | 4,862 | 0.67% | 145 | 34.3 | Township |
| Littlestown | 5 | 4,892 | 4,787 | 0.53% | 2,675 | 1.8 | Borough |
| Carroll Valley | 6 | 4,026 | 3,938 | 0.55% | 749 | 5.4 | Borough |
| Menallen township | 7 | 3,798 | 3,695 | 0.85% | 89 | 42.7 | Township |
| McSherrystown | 8 | 3,144 | 3,079 | 0.51% | 6,141 | 0.5 | Borough |
| Union township | 9 | 3,139 | 3,063 | 0.77% | 182 | 17.3 | Township |
| Germany township | 10 | 2,909 | 2,843 | 0.69% | 269 | 10.8 | Township |
| Fairfield township | 11 | 2,788 | 2,831 | -0.39% | 230 | 12.1 | Township |
| Latimore township | 12 | 2,705 | 2,643 | 0.74% | 128 | 21.1 | Township |
| Huntington township | 13 | 2,451 | 2,392 | 0.82% | 98 | 25.1 | Township |
| Hamiltonban township | 14 | 2,351 | 2,295 | 0.77% | 60 | 39.1 | Township |
| Fairfield township | 15 | 2,025 | 2,047 | -0.25% | 33 | 61.4 | Township |
| New Oxford | 16 | 1,912 | 1,867 | 0.58% | 3,089 | 0.6 | Borough |
| Bonneauville | 17 | 1,797 | 1,760 | 0.5% | 1,860 | 1.0 | Borough |
| East Berlin | 18 | 1,575 | 1,543 | 0.51% | 2,240 | 0.7 | Borough |
| Biglerville | 19 | 1,251 | 1,227 | 0.48% | 1,922 | 0.7 | Borough |
| Abbottstown | 20 | 1,047 | 1,023 | 0.58% | 1,918 | 0.5 | Borough |
| Highland township | 21 | 1,020 | 0 | 0.69% | 84 | 12.1 | Township |
| Arendtsville | 22 | 885 | 867 | 0.45% | 1,105 | 0.8 | Borough |
| Bendersville | 23 | 752 | 736 | 0.53% | 1,664 | 0.5 | Borough |
| York Springs | 24 | 702 | 685 | 0.57% | 3,528 | 0.2 | Borough |
| Fairfield | 25 | 543 | 530 | 0.56% | 807 | 0.7 | 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.
Gettysburg is the largest city in Adams County.
Fairfield is the smallest city in Adams County.
There are 25 cities in Adams County, Pennsylvania.