35 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rumford | 1 | 5,855 | 5,873 | -0.95% | 85 | 69 | Town |
| Norway | 2 | 5,366 | 5,091 | 0.37% | 119 | 45 | Town |
| Paris | 3 | 5,321 | 5,185 | -0.54% | 130 | 41 | Town |
| Oxford | 4 | 4,403 | 4,235 | 0.05% | 114 | 39 | Town |
| Fryeburg | 5 | 3,601 | 3,370 | 0.53% | 62 | 58 | Town |
| Bethel | 6 | 2,788 | 2,511 | 1.27% | 43 | 65 | Town |
| Mexico | 7 | 2,775 | 2,756 | -0.29% | 119 | 23 | Town |
| Dixfield | 8 | 2,302 | 2,254 | -0.22% | 56 | 41 | Town |
| Buckfield | 9 | 2,111 | 1,987 | 0.33% | 56 | 38 | Town |
| Otisfield | 10 | 1,863 | 1,857 | -0.59% | 47 | 40 | Town |
| West Paris | 11 | 1,758 | 1,767 | -0.68% | 73 | 24 | Town |
| Hiram | 12 | 1,721 | 1,612 | 0.53% | 46 | 38 | Town |
| Brownfield | 13 | 1,706 | 1,643 | -0.12% | 38 | 44 | Town |
| Waterford | 14 | 1,635 | 1,578 | -0.12% | 33 | 50 | Town |
| Porter | 15 | 1,630 | 1,608 | -0.55% | 52 | 32 | Town |
| Peru | 16 | 1,484 | 1,486 | -0.74% | 32 | 47 | Town |
| Woodstock | 17 | 1,408 | 1,358 | -0.49% | 31 | 46 | Town |
| Hebron | 18 | 1,281 | 1,225 | 0.16% | 57 | 22 | Town |
| Denmark | 19 | 1,260 | 1,201 | 0.72% | 27 | 46 | Town |
| Hartford | 20 | 1,235 | 1,209 | -0.72% | 28 | 44 | Town |
| Lovell | 21 | 1,153 | 1,103 | -0.17% | 27 | 43 | Town |
| Canton | 22 | 1,112 | 1,128 | -0.27% | 38 | 29 | Town |
| Sumner | 23 | 999 | 994 | -0.4% | 23 | 44 | Town |
| Andover | 24 | 885 | 753 | -0.56% | 15 | 57 | Town |
| Greenwood | 25 | 759 | 773 | -0.91% | 18 | 42 | Town |
| Stow | 26 | 454 | 397 | 0.89% | 19 | 24 | Town |
| Sweden | 27 | 432 | 404 | 0.93% | 15 | 29 | Town |
| Newry | 28 | 429 | 412 | 0% | 7 | 62 | Town |
| Roxbury | 29 | 362 | 364 | -0.55% | 8 | 43 | Town |
| Hanover | 30 | 310 | 287 | 0.98% | 44 | 7 | Town |
| Stoneham | 31 | 276 | 259 | 0.73% | 8 | 34 | Town |
| Gilead | 32 | 199 | 193 | 0% | 11 | 19 | Town |
| Byron | 33 | 103 | 105 | -0.96% | 2 | 52 | Town |
| Upton | 34 | 70 | 69 | 0% | 2 | 40 | Town |
| Lincoln | 35 | 39 | 41 | -2.5% | 1 | 33 | Plantation |
Rumford is the largest city in Oxford County, with a population of 5,855.
Lincoln is the smallest city in Oxford County, with a population of 39.
There are 35 cities in Oxford County, Maine.