Lakes / Oklahoma / Washington County
Lakes in Washington County, Oklahoma
3 lakes counted in Washington County - the largest is Copan Lake at 4,054.44 acres.
3
Lakes Counted
4,054.44 acres
Largest - Copan Lake
Washington County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Copan Lake | Washington | 4,054.44 acres | - |
| 2 | Youngs Lake | Washington | 55.85 acres | - |
| 3 | Long Lake | Washington | 29.16 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.