New Philadelphia is an unincorporated community in Franklin Township, Washington County, in the U.S. state of Indiana.
History New Philadelphia was originally called Philadelphia, and under the latter name was laid out in 1837.
A post office was established at New Philadelphia in 1833, and remained in operation until it was discontinued in 1938.
Geography New Philadelphia is located at .
Notable people John M. Bloss 1860, third President of Oregon State University, was born in New Philadelphia.
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