| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Erie | 1 | 91,194 | 94,861 | -0.7% | 4,767 | 19 | City |
| Millcreek | 2 | 52,480 | 54,031 | -0.38% | 1,636 | 32 | Township |
| Fairview | 3 | 18,115 | 17,447 | 0.56% | 509 | 36 | Township |
| Harborcreek | 4 | 16,574 | 16,616 | -0.17% | 486 | 34 | Township |
| Fairview | 5 | 11,608 | 11,140 | 0.99% | 402 | 29 | Township |
| Summit | 6 | 7,807 | 7,353 | 3.55% | 325 | 24 | Township |
| North East | 7 | 6,420 | 6,525 | -0.06% | 152 | 42 | Township |
| Edinboro | 8 | 6,000 | 4,962 | 3.63% | 2,624 | 2 | Borough |
| Corry | 9 | 5,949 | 6,197 | -0.73% | 992 | 6 | City |
| Girard | 10 | 4,780 | 4,867 | 0% | 152 | 31 | Township |
| Fairview | 11 | 4,750 | 4,666 | 0.17% | 499 | 10 | Township |
| Greene | 12 | 4,425 | 4,491 | -0.07% | 118 | 37 | Township |
| McKean | 13 | 4,331 | 4,415 | -0.21% | 118 | 37 | Township |
| North East | 14 | 4,002 | 4,099 | -0.4% | 3,071 | 1 | Borough |
| Waterford | 15 | 3,842 | 3,895 | -0.26% | 77 | 50 | Township |
| Conneaut | 16 | 3,688 | 4,189 | -3.56% | 86 | 43 | Township |
| Lawrence Park | 17 | 3,666 | 3,813 | -0.49% | 1,996 | 2 | Township |
| Wesleyville | 18 | 3,089 | 3,215 | -0.74% | 5,828 | 1 | Borough |
| Girard | 19 | 2,889 | 2,985 | -0.58% | 1,233 | 2 | Borough |
| Lake City | 20 | 2,824 | 2,927 | -0.63% | 1,572 | 2 | Borough |
| Union City | 21 | 2,802 | 2,919 | -0.74% | 1,531 | 2 | Borough |
| Fairview | 22 | 1,946 | 1,968 | 0.15% | 80 | 24 | Township |
| Elk Creek | 23 | 1,850 | 1,786 | 1.09% | 53 | 35 | Township |
| Greenfield | 24 | 1,777 | 1,795 | 0% | 53 | 34 | Township |
| LeBoeuf | 25 | 1,662 | 1,664 | 0.54% | 50 | 33 | Township |
| Union | 26 | 1,538 | 1,546 | -0.19% | 42 | 36 | Township |
| Albion | 27 | 1,470 | 1,519 | -0.61% | 1,364 | 1 | Borough |
| Waterford | 28 | 1,421 | 1,471 | -0.63% | 1,159 | 1 | Borough |
| Fairview | 29 | 928 | 950 | -0.32% | 50 | 19 | Township |
| Cranesville | 30 | 561 | 568 | -0.36% | 600 | 1 | Borough |
| Girard | 31 | 544 | 562 | -0.55% | 9.0 | 63 | Township |
| McKean | 32 | 477 | 478 | 0% | 834 | 1 | Borough |
| Platea | 33 | 429 | 439 | -0.46% | 128 | 3 | Borough |
| Mill Village | 34 | 375 | 392 | -0.79% | 408 | 1 | Borough |
| Wattsburg | 35 | 337 | 350 | -0.88% | 1,131 | 0 | Borough |
| Elgin | 36 | 196 | 204 | -1.01% | 133 | 1 | Borough |
| Fairview | 37 | 179 | 170 | 1.13% | 1,584 | 0 | Borough |
Erie is the largest city in Erie County, with a population of 91,194.
Fairview is the smallest city in Erie County, with a population of 179.
There are 37 cities in Erie County, Pennsylvania.