Coldbrook, Illinois Unincorporated community Coldbrook, Illinois Show map of Illinois Coldbrook, Illinois Show map of the US Coordinates: 40°56′51″N 90°31′02″W﻿ / ﻿40.94750°N 90.51722°W﻿ / 40.94750; -90.51722Coordinates: 40°56′51″N 90°31′02″W﻿ / ﻿40.94750°N 90.51722°W﻿ / 40.94750; -90.51722 Country United States State Illinois County Warren Elevation 771 ft (235 m) Time zone Central (CST) (UTC-6) • Summer (DST) CDT (UTC-5) Area code(s) 309 GNIS feature ID 422568[1]