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Lane County is the fourth most populous county (following Multnomah, Washington and Clackamas counties). Since the 1980s, population in the Eugene, Cascades & Coast region has been growing at a slow, steady rate. Eugene is the designated county seat.
In 2008, Portland State University conducted a Population Forecast for Lane County 2008-2035. This report is full of statistical information about Lane County and the Eugene-Springfield populous area.
2011 Population Estimates:
| Lane County | 353,155 |
| Coburg | 1,045 |
| Cottage Grove | 9,745 |
| Creswell | 5,015 |
| Eugene | 157,010 |
| Florence | 8,470 |
| Junction City | 5,445 |
| Lowell | 1,045 |
| McKenzie River Valley | 2,956 |
| Oakridge - Westfir | 3,455 |
| Springfield | 59,695 |
| Veneta - Fern Ridge | 4,610 |
| Source: 2011 Population Research Center, Portland State University and U.S. Census Bureau |