| microtus richardsoni | | USA: Washington, Whatcom Co., W of FR700, 0.80 mi from jct of FR700 and FR5400 | | 66476304 |
| microtus richardsoni | | USA: Washington, Whatcom Co., just N of FR5400, Harts Pass | | 66476302 |
| microtus richardsoni | | USA: Washington, Okanogan Co., S of Meadows Campground on FR500 | | 66476300 |
| microtus richardsoni | | USA: Washington, Kittitas Co., Milk Creek, 3 mi N of Cliffdell, FR1708 | | 66476298 |
| microtus richardsoni | | USA: Washington, Columbia Co., Touchet River, 5 mi on FS64 from USF entrance | | 66476296 |
| microtus richardsoni | | USA: Washington, Columbia Co., 26 km SE Dayton, FR64 along Touchet River | | 66476294 |
| microtus richardsoni | | USA: Washington, Columbia Co., 26 km SE Dayton, FR64 along Touchet River | | 66476292 |
| microtus richardsoni | | USA: Washington, Chelan Co., off Hwy 2, 7 miles on FS6700, onto FS6704 | | 66476290 |
| microtus richardsoni | | USA: Washington, Chelan Co., off Hwy 2, 7 miles on FS6700, onto FS6704 | | 66476288 |