Fillmore is a village in Montgomery County, Illinois, United States. The population was 305 at the 2020 census. Fillmore is in southeastern Montgomery County, 14 miles east-southeast of Hillsboro, the county seat, and 18 miles northwest of Vandalia. According to the U.S. Census Bureau, Fillmore has a total area of 1.02 square miles, all land. Lanes Branc…Fillmore is a village in Montgomery County, Illinois, United States. The population was 305 at the 2020 census. Fillmore is in southeastern Montgomery County, 14 miles east-southeast of Hillsboro, the county seat, and 18 miles northwest of Vandalia. According to the U.S. Census Bureau, Fillmore has a total area of 1.02 square miles, all land. Lanes Branch flows through the west side of the village, running southwest to the Dry Fork of Hurricane Creek, part of the Kaskaskia River watershed.
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