Castalian Springs, TN is a city located in Sumner County, Tennessee and has a land area of 38.25 square miles (99.07 km2). The water area for the city is 1.76 square miles or 4.56 km2. There is one unique zip code in Castalian Springs, Tennessee and it is 37031. The area code(s) for Castalian Springs is 615.
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