The Riverside Avenue Historic District is a 16.5 acres (6.7 ha) historic district in Downtown Spokane, Washington which was listed on the National Register of Historic Places in 1976. The listing includes 14 contributing properties, nine of which are considered primary and five are considered secondary. The district runs primarily along Riverside Avenue for five blocks from Monroe Street on the east to Walnut Street on the west. Additionally, some adjacent buildings that front Main Street, one block north of Riverside; Sprague Avenue, one block south of Riverside; and Cedar Street, which intersects Riverside in the west are also included. A tree-lined parkway in the middle of the street runs through this stretch of Riverside from Monroe to Cedar, then up Cedar for one block to First Ave.