Crossville is a city in and the county seat of Cumberland County, Tennessee, United States. It is part of the Crossville Micropolitan Statistical Area. The population was 12,071 at the 2020 census.
 Crossville developed at the intersection of a branch of the Great Stage Road, which connected the Knoxville area with the Nashville area, and the Kentucky Stock Road, a cattle drovers' path connecting Middle Tennessee with Kentucky and later extending south to Chattanooga. These two roads are roughly paralleled by modern US-70 and US-127, respectively.
 Around 1800, an early American settler, Samuel Lambeth, opened a store at this junction, and the small community that developed around it became known as Lambeth's Crossroads. The store was at what has become the intersection of Main and Stanley Streets, just south of the courthouse. By the time a post office was established in the 1830s, the community had taken the name "Crossville". In the early 1850s, James Scott, a merchant from nearby Sparta, purchased Lambeth's store and renamed it Scott's Tavern.
 When Cumberland County was formed in 1856, Crossville, being nearest to the center of the county, was chosen as county seat. Scott donated the initial 40 acres (160,000 m2) for the erection of a courthouse and town square.
 Crossville and Cumberland County suffered rampant pillaging throughout the Civil War as the well-developed roads made the area accessible to both occupying Union and Confederate forces and bands of renegade guerrillas. With divided communities and families, there was vicious guerrilla warfare, and residents suffered as if there were major battles in the area. The county was divided throughout the conflict, sending a roughly equal number of troops to both sides.
 After World War I, U.S. 70 helped connect the town and area to markets for its produce and goods. Additional highways built after World War II improved transportation in the region.
 During the Great Depression, the federal government's Subsistence Homestead Division initiated a housing project south of Crossville known as the Cumberland Homesteads. The project's purpose was to provide small farms for several hundred impoverished families. The project's recreational area later became the nucleus for Cumberland Mountain State Park. In 1934, First Lady Eleanor Roosevelt visited Crossville and the Cumberland Homesteads Project.
 Crossville was a sundown town as late as the 1950s, with a sign at the city limits warning African Americans not to stay after nightfall.
 Crossville is located at the center of Cumberland County at 35°57′15″N 85°1′53″W﻿ / ﻿35.95417°N 85.03139°W﻿ / 35.95417; -85.03139 (35.954221, -85.031267). The city is situated atop the Cumberland Plateau amid the headwaters of the Obed River, which slices a gorge north of Crossville en route to its confluence with the Emory River to the northeast. Crossville is roughly halfway between the plateau's eastern escarpment along Walden Ridge and its western escarpment along the Highland Rim. Several small lakes are on Crossville's outskirts, including Lake Tansi to the south, Lake Holiday to the west, and Byrd Lake at nearby Cumberland Mountain State Park. The average elevation of Crossville is about 1,890 feet (580 m) above sea level.
 Crossville developed at the intersection of two major stage roads by which settlers moved through the area. The roads were gradually widened, improved and turned into paved roads. Two major federal highways—U.S. Route 70, which traverses Tennessee from east to west, and U.S. Route 127, which traverses Tennessee from north to south—now roughly follow the old routes. Interstate 40, which runs roughly parallel to U.S. 70, passes through the northern part of Crossville. Crossville is about 35 miles (56 km) east of Cookeville, 80 miles (130 km) north of Chattanooga, and 70 miles (110 km) west of Knoxville.
 According to the United States Census Bureau, Crossville has an area of 20.3 square miles (52.7 km2), of which 20.0 square miles (51.7 km2) is land and 0.4 square miles (1.0 km2), or 1.95%, is water.
 Crossville has a humid subtropical climate (Köppen Cfa), with warm summers and cool winters. Temperatures in Crossville are moderated by the city's high elevation and the Cumberland Plateau. Precipitation is abundant and evenly distributed (although the early autumn months are drier), with an average of 55.55 in (1,411 mm). Snowfall is moderate and somewhat common, with an average of 14.2 in (36 cm).
 As of the 2020 United States census, there were 12,071 people, 5,040 households, and 2,777 families residing in the city.
 As of the census of 2000, there were 8,981 people, 3,795 households, and 2,440 families residing in the city. The population density was 609.2 inhabitants per square mile (235.2/km2). There were 4,268 housing units at an average density of 289.5 per square mile (111.8/km2). The racial makeup of the city was 97.12% White, 0.04% African American, 0.23% Native American, 0.35% Asian, 0.04% Pacific Islander, 1.04% from other races, and 1.18% from two or more races. Hispanic or Latino people of any race were 2.43% of the population.
 There were 3,795 households, out of which 27.4% had children under the age of 18 living with them, 45.2% were married couples living together, 15.5% had a female householder with no husband present, and 35.7% were non-families. 31.3% of all households were made up of individuals, and 13.1% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.79.
 In the city, the population was spread out, with 22.6% under the age of 18, 9.3% from 18 to 24, 26.5% from 25 to 44, 21.8% from 45 to 64, and 19.9% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 85.0 males. For every 100 females age 18 and over, there were 81.5 males.
 The median income for a household in the city was $25,796, and the median income for a family was $33,207. Males had a median income of $26,735 versus $20,217 for females. The per capita income for the city was $18,066. About 21.7% of families and 24.6% of the population were below the poverty line, including 36.2% of those under age 18 and 20.6% of those age 65 or over.
 Recent population estimates show the population of Crossville around 11,498 in 2008.