| State Route 643 | |
|---|---|
| Route information | |
| Length: | 10.12 mi (16.29 km) |
| Existed: | 1936 – present |
| Major junctions | |
| West end: | SR 645 near Clifton |
| East end: | SR 7100 near Burke |
| Highway system | |
Fairfax County Route 643 is a major secondary road in western Fairfax County, Virginia. This route is composed of three disconnected segments: