 A Blackford County directory from that time lists over 150 people living in Millgrove.The railroad line that ran through Millgrove was named Union and Logansport Railroad Company by the time it entered Blackford County, and it was the county’s first railroad.This line was proposed in 1862, and completed to Hartford City in 1867 — running through the Blackford County communities of Dunkirk, Converse, Millgrove, Hartford City, and Renner (See railroad map — Millgrove is located in the southeast quadrant of Blackford County.