Hilltop Lakes is in southwestern Leon County, 27 miles (43 km) southwest of Centerville, the county seat. The community is built around several artificial lakes, including Mirror Lake, Swan Lake, Kickapoo Lake, Cherokee Lake, and Lake Tonkawa. The lakes are built on Running Creek or a tributary, with Running Creek flowing south to the Navasota River.
According to the U.S. Census Bureau, the Hilltop Lakes CDP has a total area of 8.7 square miles (22.6 km2), of which 8.5 square miles (22.1 km2) are land and 0.2 square miles (0.5 km2), or 2.37%, are water.[1]