Gulf Trough with quartz sands, silts, and clays via rivers and streams. The first sedimentation layer in Leon County is the Oligocene Suwannee Limestone in the southeastern part of the county as stated by the United States Geological Survey and Florida Geological Survey. The Early Miocene (~23.03—15.7 Ma) sedimentation in Leon County is Hawthorn Group, Torreya Formation and St. Marks Formation and found in the northern two-thirds of the county. The Pliocene (~5.332—2.588 Ma) is represented by the Miccosukee Formation scattered within the Torreya Formation. Sediments were laid down from the Pleistocene epoch (~2.588 million—12 000 years ago) through Holocene epoch (~12,000—present) and are designated Beach ridge and trail and undifferentiated sediments. Terraces and shorelines During the Pleistocene, what would be Leon County emerged and submerged with each glacial and interglacial period. Interglacials created the county's topography. Also See Leon County Pleistocene coastal terraces Also see: Florida Platform and Lithostratigraphy Geologic formations Red Hills Region (North) Cody Scarp (central) Woodville Karst Plain (South) Paleontology Three sites in Leon County have yielded fossil remnants of the Miocene epoch. National protected area Apalachicola National Forest (part) Bodies of water Lake Miccosukee Black Creek Lake Bradford Lake Ella Lake Hall Lake Iamonia Lake Jackson Lake Lafayette Lake Talquin Ochlockonee River Lake Munson Adjacent counties Grady County, Georgia - north Thomas County, Georgia - northeast Jefferson County - east Wakulla County - south Gadsden County - west Liberty County - west Demographics 2020 census As of the 2020 United States census, there were 292,198 people, 116,530 households, and 61,961 families residing in the county. 2010 census Race As of the census of 2010, there were 275,487 people, and 108,592 households residing in the county. The population density was . There were 123,423 housing units at an average density of . The racial makeup of the county was 63.0% White, 30.3% Black or African American, 0.3% Native American, 2.9% Asian, 0.1% Pacific Islander, and 2.2% from two or more races. 5.6% of the population were Hispanic or Latino of any race. Age There were 108,592 households, out of which 24.2% had children under the age of 18 living with them, 36.9% were married couples living together, 13.1% had a female householder with no husband present, and 45.8% were non-families. 31.0% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older. The average household