Washington State Route 300
Map of Mason County in western Washington with SR 300 highlighted in red | ||||
| Route information | ||||
| Auxiliary route of SR 3 | ||||
| Maintained by WSDOT | ||||
| Length | 3.35 mi (5.39 km) | |||
| Existed | 1964–present | |||
| Major junctions | ||||
| West end | Belfair State Park | |||
| East end | SR 3 in Belfair | |||
| Location | ||||
| Country | United States | |||
| State | Washington | |||
| Counties | Mason | |||
| Highway system | ||||
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State Route 300 (SR 300) is a short state highway in Mason County, in the U.S. state of Washington. It extends 3.35 miles (5.39 km) from Belfair State Park to SR 3 in the community of Belfair. The route serves as a connector from Belfair State Park to Belfair and SR 3. The highway was Secondary State Highway 21C (SSH 21C) from 1957 until 1964.