Illogan is a village and civil parish in west Cornwall, England, United Kingdom, two miles northwest of Redruth. The population of Illogan was 5,404 at the 2011 census. In the same year the population of the Camborne-Redruth urban area, which also includes Carn Brea, Illogan and several satellite villages, stood at 55,400 making it the largest conurbation in Cornwall.