Washington State Route 546

State Route 546
A map of northern Whatcom County with SR 546 highlighted in red
Route information
Auxiliary route of I-5
Maintained by WSDOT
Length	8.02 mi[1] (12.91 km)
Existed	1964–present
Major junctions
West end	SR 539 near Lynden
East end	SR 9 near Sumas
Location
Country	United States
State	Washington
Counties	Whatcom
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 544 → SR 547

State Route 546 (SR 546) is a state highway in Whatcom County, Washington, United States. It runs east–west for 8 miles (13 km) near the Canadian border, connecting SR 539 near Lynden to SR 9 near Nooksack and Sumas. The highway is a major freight corridor and serves as an alternate route between Bellingham and the Sumas border crossing.

The highway runs along Badger Road, which was built in the 1890s and paved by the county government in 1922 per the request of citizen petitions. It was incorporated into the state highway system from 1937 to 1951 as part of Secondary State Highway 1A (SSH 1A), which connected to Blaine and Sedro-Woolley. The Lynden section was replaced with a southerly route and re-designated as a branch of SSH 1B in 1957. During the 1964 state highway renumbering, SR 546 replaced the SSH 1B branch, while the rest of the highway became SR 539. Between 2013 and 2016, the state government built a set of three roundabouts on SR 546 in northern Lynden to replace intersections that had been the site of major collisions.