Marble Falls is a city in Burnet County, Texas, United States. As of the 2020 United States Census, the city population was 7,033. Lake Marble Falls is part of the Highland Lakes on the Colorado River, the largest chain of lakes in Texas. Marble Falls was founded by Adam Rankin Johnson in 1887, a former Indian fighter and Confederate general.

Burnet County is a county located on the Edwards Plateau in the U.S. state of Texas. As of the 2020 census, its population was 49,130. Its county seat is Burnet. The county was founded in 1852 and later organized in 1854. It is named for David Gouverneur Burnet, the first (provisional) president of the Republic of Texas. The name of the county is pronounced with the emphasis or accent on the first syllable, just as is the case with its namesake.