Topock is a small unincorporated community and census-designated place in Mohave County, Arizona, United States. As of the 2020 census, the population within the CDP was 2. Topock and the surrounding region have a ZIP Code of 86436; in 2010, the population of the 86436 ZCTA was 2,104, almost all of whom live in the Golden Shores CDP to the north. Topock lies between Bullhead City and Lake Havasu City and southeast of Needles, California, on the California–Arizona border.