Appointments are necessary to do research at the library.
Brookville Historical Society, Inc. genealogy library has a lot of information from early Montgomery County, Ohio. Some of the holdings include cemetery readings and indexes, old newspaper articles and obituaries, surname files, many family histories, early plat maps, and histories from area counties. The collection is focused around Brookville and surrounding townships in northwest Montgomery County, northeast Preble County, Southwest Miami County, and southeast Darke County in Ohio. This includes the townships of Clay, Jackson, Jefferson, Madison, Perry, and Randolph in Montgomery County. Over one thousand family histories and file folders.