Riparia is an extinct town in Whitman County, in the U.S. state of Washington. The GNIS classifies it as a populated place.
A post office called Riparia was in operation between 1882 and 1963. The community most likely took its name from a nearby riparian zone.
Riparia was a railway stop along the Snake River approximately 81 miles Northeast of Pasco, WA. The town featured a bridge across the Snake River and a hotel.
From April 6, 1917 (coinciding with the declaration of war on the German Empire) till October 16, 1917 a detachment of Company F 2nd Idaho Infantry garrisoned Riparia to guard railroad and waterway infrastructure from sabotage concerns. September 19, 1917 the unit was redesignated Company F, 116th Engineer Regiment, 41st Division.General Orders, No. 2. Headquarters 41st National Guard Division, Camp Grene, N.C. September 19, 1917
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