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Cerulean is a census-designated place and unincorporated community in Trigg and Christian counties, Kentucky, United States. At one time, it was a city, incorporated as Cerulean Springs. It lies along Kentucky Routes 124 and 126 northeast of the city of Cadiz, the county seat of Trigg County. Its elevation is 512 feet (156 m), and it is located at 36°57′34″N 87°42′36″W. It has a post office with the ZIP code 42215. As of the 2020 census, Cerulean had a population of 303.