According to the Texas Online web site Miller Grove was probably first settled sometime in the late 1840s. Among the earliest residents was the Miller family, for whom the community is named.  The Presbyterian church is said to have been organized in 1848. The post office was established around 1869.  J. J. Hill was the first postmaster. By 1885 Miller Grove had a steam grist and saw mill, a district school, three churches, and a population of thirty. By the early 1890s Miller Grove's population was 100.  In 1905 the Miller Grove public school had an enrollment of 114. In the late 1940s the Miller Grove had two churches, three stores, a cotton gin, a feed mill, a hardwood sawmill, and a machine shop. Miller Grove's population in 1948 was estimated at 250.  At that time Miller Grove School had ten teachers. In the early 1980s Miller Grove had a cemetery, a sawmill, a school, two churches, four stores, and a number of scattered houses.  According to the 1990 census the population of Miller Grove was estimated at 115.

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Miller Grove school was built in 1907 as a two room
two teacher school. Rooms were added later as more teachers were hired. The Woodmen of the World built
the upstairs room as a meeting room. the room was
later used as classrooms and auditorium.