Washington State Route 204

State Route 204
Map of Snohomish County in western Washington with SR 204 highlighted in red
Route information
Auxiliary route of US 2
Defined by RCW 47.17.395
Maintained by WSDOT
Length:	2.38 mi (3.83 km)
Existed:	1964 – present
Major junctions
West end:	US 2 east of Everett
East end:	SR 9 at Lake Stevens
Location
Counties:	Snohomish
Highway system
State highways in Washington Interstate US State Scenic Former PSH 1964 renumbering Former ← SR 203 I‑205 →

State Route 204 is a 2.38-mile (3.83 km) Washington state highway in Snohomish County that begins at U.S. Route 2 (US 2) east of Everett travelling northeast to its termimus at SR 9 in the city of Lake Stevens. It is also referred to as SR 204 or Hwy 204 and less commonly as Snohomish-Marysville Road. Originally the western segment of Secondary State Highway 15A (SSH 15A) from 1937 until 1964, the highway was established in the current form in 1964.

State Route 204 (SR 204) begins at its junction with U.S. Route 2 (US 2) at Cavelero Corner, east of Everett. From there, the highway heads in a generally northeast direction, ending at its junction with SR 9 in the city of Lake Stevens. At the junction with SR 9 in 2007, the road had an estimated daily average of 25,000 motorists, making it the busiest point along the highway; in 1970, it had a daily average of 7,300, an addition of about 656 motorists a year.

When the primary and secondary highways were created in 1937, Secondary State Highway 15A (SSH 15A) ran from Primary State Highway 15 (PSH 15), which would later become U.S. Route 2 (US 2) in 1946, to a brief concurrency with SSH 1A and northeast to Granite Falls. The Washington State Legislature replaced the Primary and secondary highways with a new numbering system during the highway renumbering in 1964; PSH 15 became US 2, SSH 15A from US 2 to SSH 1A became SR 204, the SSH 1A concurrency became part of SR 9 and the rest of SSH 15A from SSH 1A to Granite Falls became SR 92.