Identifiers: city · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Eugene (city), OR | 176,654 |
| 2 | Springfield (city), OR | 61,851 |
| 3 | Santa Clara (CDP), OR | 11,239 |
| 4 | Cottage Grove (city), OR | 10,574 |
| 5 | River Road (CDP), OR | 8,732 |
| 6 | Junction City (city), OR | 6,787 |
| 7 | Creswell (city), OR | 5,641 |
| 8 | Veneta (city), OR | 5,214 |
| 9 | Harrisburg (city), OR | 3,652 |
| 10 | Brownsville (city), OR | 1,694 |
| 11 | Coburg (city), OR | 1,306 |
| 12 | Lowell (city), OR | 1,196 |
| 13 | Halsey (city), OR | 962 |
| 14 | Dexter (CDP), OR | 893 |
| 15 | Jasper (CDP), OR | 793 |
| 16 | Monroe (city), OR | 647 |
| 17 | Marcola (CDP), OR | 580 |
| 18 | Elmira (CDP), OR | 546 |
| 19 | Trent (CDP), OR | 339 |
| 20 | Cheshire (CDP), OR | 329 |