There are 52 cities in Delaware 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 | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Philadelphia | 1 | 1,533,828 | 1,600,684 | -1.08% | 11,416 | 134.4 | City |
| Upper Darby township | 2 | 84,894 | 85,573 | 0% | 10,849 | 7.8 | Township |
| Haverford township | 3 | 50,511 | 50,383 | 0.02% | 5,079 | 9.9 | Township |
| Chester | 4 | 33,933 | 32,580 | 1.01% | 7,021 | 4.8 | City |
| Radnor township | 5 | 33,765 | 33,210 | 0.1% | 2,452 | 13.8 | Township |
| Ridley township | 6 | 30,715 | 30,931 | 0.03% | 6,005 | 5.1 | Township |
| Springfield township | 7 | 24,868 | 25,044 | 0.01% | 3,934 | 6.3 | Township |
| Marple township | 8 | 24,114 | 24,200 | 0.13% | 2,364 | 10.2 | Township |
| West Chester | 9 | 19,988 | 18,667 | 1.68% | 10,828 | 1.8 | Borough |
| Concord township | 10 | 18,209 | 18,269 | 0.14% | 1,337 | 13.6 | Township |
| Middletown township | 11 | 17,152 | 16,343 | 1.64% | 1,273 | 13.5 | Township |
| Upper Chichester township | 12 | 16,789 | 16,880 | 0.05% | 2,510 | 6.7 | Township |
| Aston township | 13 | 16,620 | 16,783 | 0.01% | 2,845 | 5.8 | Township |
| Newtown township | 14 | 15,335 | 15,052 | 0.42% | 1,531 | 10.0 | Township |
| Nether Providence township | 15 | 14,483 | 14,497 | 0.15% | 3,072 | 4.7 | Township |
| Yeadon | 16 | 12,318 | 12,034 | 0.58% | 7,723 | 1.6 | Borough |
| Lansdowne | 17 | 11,070 | 11,096 | -0.06% | 9,373 | 1.2 | Borough |
| Upper Providence township | 18 | 10,792 | 10,858 | 0.06% | 1,927 | 5.6 | Township |
| Darby | 19 | 10,585 | 10,700 | -0.27% | 12,571 | 0.8 | Borough |
| Bethel township | 20 | 9,647 | 9,597 | 0.13% | 1,783 | 5.4 | Township |
| Darby township | 21 | 9,135 | 9,210 | -0.02% | 6,451 | 1.4 | Township |
| Collingdale | 22 | 8,813 | 8,892 | -0.23% | 10,142 | 0.9 | Borough |
| Brookhaven | 23 | 8,291 | 8,291 | 0% | 4,854 | 1.7 | Borough |
| Ridley Park | 24 | 7,199 | 7,265 | -0.24% | 6,672 | 1.1 | Borough |
| Glenolden | 25 | 7,150 | 7,220 | -0.25% | 7,333 | 1.0 | Borough |
| Thornbury township | 26 | 6,910 | 6,895 | 0% | 748 | 9.2 | Township |
| Clifton Heights | 27 | 6,777 | 6,851 | -0.28% | 10,757 | 0.6 | Borough |
| Folcroft | 28 | 6,716 | 6,790 | -0.28% | 5,394 | 1.2 | Borough |
| Swarthmore | 29 | 6,534 | 6,540 | -0.03% | 4,667 | 1.4 | Borough |
| Prospect Park | 30 | 6,357 | 6,425 | -0.27% | 8,684 | 0.7 | Borough |
| Sharon Hill | 31 | 5,942 | 6,006 | -0.27% | 7,697 | 0.8 | Borough |
| Norwood | 32 | 5,874 | 5,937 | -0.27% | 7,550 | 0.8 | Borough |
| Media | 33 | 5,852 | 5,890 | -0.17% | 7,670 | 0.8 | Borough |
| Edgmont township | 34 | 4,752 | 4,293 | 3.17% | 490 | 9.7 | Township |
| Narberth | 35 | 4,487 | 4,491 | -0.02% | 8,920 | 0.5 | Borough |
| Aldan | 36 | 4,198 | 4,245 | -0.29% | 7,032 | 0.6 | Borough |
| Chester township | 37 | 4,029 | 4,067 | -0.03% | 2,821 | 1.4 | Township |
| Tinicum township | 38 | 3,960 | 3,980 | 0.05% | 689 | 5.8 | Township |
| Chadds Ford township | 39 | 3,945 | 3,969 | 0.1% | 456 | 8.7 | Township |
| Lower Chichester township | 40 | 3,374 | 3,403 | -0.03% | 3,144 | 1.1 | Township |
| Upland | 41 | 3,027 | 3,061 | -0.3% | 4,664 | 0.6 | Borough |
| Chester Heights | 42 | 2,917 | 2,921 | -0.03% | 1,318 | 2.2 | Borough |
| Morton | 43 | 2,750 | 2,774 | -0.22% | 7,682 | 0.4 | Borough |
| East Lansdowne | 44 | 2,679 | 2,710 | -0.3% | 13,005 | 0.2 | Borough |
| Colwyn | 45 | 2,441 | 2,469 | -0.29% | 9,461 | 0.3 | Borough |
| Eddystone | 46 | 2,428 | 2,456 | -0.29% | 2,440 | 1.0 | Borough |
| Marcus Hook | 47 | 2,425 | 2,452 | -0.29% | 2,189 | 1.1 | Borough |
| Parkside | 48 | 2,297 | 2,321 | -0.26% | 11,150 | 0.2 | Borough |
| Trainer | 49 | 1,954 | 1,978 | -0.31% | 1,849 | 1.1 | Borough |
| Millbourne | 50 | 1,198 | 1,213 | -0.33% | 16,189 | 0.1 | Borough |
| Rose Valley | 51 | 1,009 | 1,019 | -0.3% | 1,378 | 0.7 | Borough |
| Rutledge | 52 | 776 | 783 | -0.26% | 5,427 | 0.1 | 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.
Philadelphia is the largest city in Delaware County.
Rutledge is the smallest city in Delaware County.
There are 52 cities in Delaware County, Pennsylvania.