Lyon County Sheriff's Office

The Lyon County Sheriff’s Department is located in Rock Rapids, Iowa. The Sheriff’s Department is responsible for law enforcement in all towns located within Lyon County which include Alvord, Doon, George, Inwood, Larchwood, Lester, Little Rock, Rock Rapids, and the unincorporated towns of Beloit, Edna, Granite, and Klondike. Rock Rapids, IA 51246 Contact Us Lyon County • Iowa Courthouse Hours M - F 8:00 a.m. Closed Holidays Department Hours May Vary ©2026 Lyon County, Iowa · Title VI Nondiscrimination Policy powered by Upcoming Holiday Closure Schedule Christmas Eve-Office's Close at 12:00 PM (December 24, 2026) Christmas Day (December 25, 2026) Non-emergency: (712) 472-8300. Dial 911 for emergencies.