Jonestown is a city in Travis County, Texas, United States on the north shore of Lake Travis. The population was 2,365 at the 2020 census. …Jonestown is a city in Travis County, Texas, United States on the north shore of Lake Travis. The population was 2,365 at the 2020 census. Jonestown was developed by brothers Warren and Emmet A. Jones in the 1930s when they recognized the opportunity presented by the upcoming Mansfield Dam on the Colorado River. Once the dam was complete, Jonestown would become waterfront property along the Sandy Creek Arm and Big Devil's Hollow of the newly formed Lake Travis. The Jones brothers initially sold waterfront lots for $50 in 1939, raising the price to $100 and offering financing after complaints the original cost was too high.
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