Hastings is an unincorporated community and agricultural center in St. Johns County, Florida, United States, 18 miles southwest of St. Augustine. It was formerly an incorporated town, but it was dissol…Hastings is an unincorporated community and agricultural center in St. Johns County, Florida, United States, 18 miles southwest of St. Augustine. It was formerly an incorporated town, but it was dissolved in 2018 after a vote by residents. The population was 580 at the 2010 census. As of 2018, the population estimated by the U.S. Census Bureau to be 648.