From 1893 to 1903, Green Park served as a switching yard for traffic moving from the narrow-gauge Newport & Sherman's Valley Railroad (N&SVR),[REF] which ran from a connection with the Pennsylvania Railroad in Newport west to New Germantown, to the standard-gauge Perry County Railroad, which ran from Duncannon to Landisburg.
According to the 1910 U.S. Census, the population of Green Park was 178. Green Park Grange No. 1615 was organized on May 27, 1914, by Edgar A. Stambaugh, with a Pomona Grange for the county established in Green Park on May 23, 1919.