Endicott is a town in Whitman County, Washington, United States. The population was 621 at the 2000 census, but a Census error artificially inflated this total. The Washington Office of Financial Management estimated Endicott's 2000 population at 355. Endicott apartments for rent comparison page shows most up to date rent information on Endicott apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.