State Route 203 (SR 203) is a state highway in the U.S. state of Washington that traverses part of King and Snohomish counties. It runs north–south for 24 miles (39 km) through the Snoqualmie Valley, connecting Fall City, Carnation, Duvall, and Monroe. The highway terminates to the south at a roundabout with SR 202 near Fall City and to the north at a junction with U.S. Route 2 (US 2) in Monroe.

Fall City is an unincorporated community and census-designated place (CDP) in King County, Washington, United States, 25 miles (40 km) east of Seattle. The community lies along the Snoqualmie River and Raging River. The population was 2,032 as of the 2020 census.