Lakeway is a city in Travis County, Texas, United States. The population was 19,189 at the 2020 census, an increase over the figure of 11,39…Lakeway is a city in Travis County, Texas, United States. The population was 19,189 at the 2020 census, an increase over the figure of 11,391 tabulated in 2010. The city is located next to Lake Travis. It is an exurb in Greater Austin.