Travel agencies in Calera, Alabama. Calera is a city in Shelby and Chilton counties in the U.S. state of Alabama. It is the location of the Shelby County Airport. As of the 2010 census Calera had a population of 11,620, more than tripling its total in 2000, making it the fastest-growing city in Alabama. Looking for place to stay? Check out list of hotels in Calera.