Lexington is a consolidated city coterminous with Fayette County in the United States, serving as the county seat. It anchors the Lexington–Fayette metropolitan area and lies within Kentucky's Bluegrass region. The city is known as the Horse Capital of the World due to its hundreds of horse farms and major racing venues like Keeneland. Its administrative structure features a nonpartisan mayor-council government with twelve council districts, having been consolidated entirely within Fayette County since 1974.

Founded in June 1775 by frontiersmen led by William McConnell, the settlement was named after the Massachusetts town following news of the Battles of Lexington and Concord. Originally known as Fort Lexington, it received its charter from the Virginia General Assembly in May 1782. Early development included the Travelling Church's arrival in 1781 and the founding of the First African Baptist Church, which became the oldest black Baptist congregation in Kentucky by 1790.

The city is defined by its historic neighborhoods and a compact central downtown district surrounded by a sharp dividing line between suburb and countryside. Notable locations include Rupp Arena, Central Bank Center, and the National Thoroughbred Racing Association Headquarters. The University of Kentucky and Transylvania University contribute to a college town atmosphere, while the Kentucky Horse Park and The Red Mile highlight the region's equestrian heritage and scenic beauty.

Lexington's culture is heavily influenced by the horse industry and its status as home to the state's flagship university. Visitors are drawn to the rich diversity of its colleges and the picturesque landscapes protected by early urban growth legislation. The city hosts significant historical sites, including McConnell Springs and the historic South Elkhorn Christian Church, offering a blend of equestrian events, academic institutions, and deep-rooted local traditions.

As of the 2020 census, the population was 322,570, making it the second-most populous city in Kentucky. The economy is driven by the horse industry and the University of Kentucky, which is the largest employer. Access is provided via Blue Grass Airport with daily non-stop service to numerous cities, alongside extensive road networks connecting to Frankfort and Richmond. The climate supports the region's agricultural identity within the Bluegrass area.