Internal Revenue Service www.irs.gov (800) 829-3676 Forms: (800) 829-1040 Help Line   Spokane 920 W. Riverside Spokane, WA 99201 Monday-Friday 8:30 a.m.- 4:30 p.m. (509) 353-0508 Kennewick 8911 W. Grandridge Blvd. Kennewick, WA 99336 Monday-Friday 8:30 a.m.- 4:30 p.m. (Closed for lunch - 12:30 p.m. - 1:30 p.m.) (509) 376-0705