Lewisville is a city in Denton County, Texas, with a portion extending into Dallas County, located on the eastern shore of Lewisville Lake in the heart of the Dallas–Fort Worth metroplex. Its population was 111,822 at the 2020 census, making it one of the larger cities in Denton County and a key Mid-Cities community between Dallas and Fort Worth. Lewisville's growth has been defined by its location — at the junction of Interstate 35E and State Highway 121 — and by the lake that runs along its western edge. The city's roots reach back to the 19th century, when it grew as a stop along the railroad and a small agricultural center. Its modern form emerged in the latter 20th century, when the construction of the Lewisville Lake dam and the expansion of the metroplex transformed the area into a major suburban hub. The 1969 Texas International Pop Festival, held near the present lake site, is a notable footnote in the city's cultural history, briefly placing Lewisville on the national map just before the reservoir reshaped the landscape. Lake Lewisville is central to the city's identity. The reservoir covers more than 29,000 acres with over 230 miles of shoreline, making it one of North Texas's premier recreation lakes for boating, fishing, camping, and shoreline parks. The Lewisville Lake Environmental Learning Area, a large natural research and recreation preserve, adds trails and wildlife habitat to the lake's recreational role. Lewisville Independent School District is one of the region's largest, serving Lewisville and much of southern Denton County. The city's combination of central location, lake access, and a wide range of housing makes it a practical choice for commuters and families working across the northern metroplex, from Dallas and Fort Worth to Frisco, Plano, and the Alliance corridor.