Castleton Indiana Zip Code - Web castleton stats and demographics for the 46256 zip code. Zip code 46250 is located in 2 county. Web castleton, in | indianapolis, in zip code 46256: Web castleton, in zip codes. The us postal service considers castleton an alternate city name for 2 indianapolis zip codes. This is a multi county zip code, meaning it is. Zip code 46256 is located in central indiana and covers a slightly less. Basic data & usps preferred city name preferred name, usps indianapolis,.
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