Bromide is a town in Coal and Johnston counties in the U.S. state of Oklahoma. The population was 165 at the 2010 census, a 1.2 percent increase from 163 at the 2000 census.The area around Bromide was noted for its mineral water springs, and the bromide content of the water gave the town its name. It was also noted for limestone quarrying and the potential to produce manganese. Proposals to promote economic growth from these assets never materialized.