Adequate water resources are vital for municipal needs in the Cumberland River watershed. As a result of continuing population growth, moderate to extreme droughts and floods, demands for competing water resources, and aging infrastructure, the evaluation of ongoing water-resources issues has become increasingly important to Federal, State, and local water-resources managers. In order to assist local decision makers in the watershed, the U.S. Geological Survey (USGS) began a study in 2013 to document groundwater and surface-water withdrawals. Estimates of water use for public supply were projected in 10-year increments through 2040 and were based on 2010 public supply water data and population projections for 2020 through 2040. The data for public supply water systems located in Tennessee were obtained from the Tennessee Department of Environment and Conservation, Division of Water Resources. The data for public-supply water systems located in Kentucky were obtained from the USGS office in Louisville, Kentucky. This dataset includes U.S. Census Population Data from the U.S. Census Bureau for 2000 and 2010; population projections from the Center for Business and Economic Research in Tennessee; and population projections from the Kentucky State Data Center for 2020, 2030, and 2040. Also included is a sample calculation of water-use projections in 2020, 2030, and 2040 for one of the public-supply systems in the Cumberland River watershed; Franklin Water Department - Franklin, Williamson County, Tennessee. Data in this release were used to support the projections and trends analysis published in the companion report Robinson (2019). Reference Robinson, J.A., 2019, Estimated use of water in the Cumberland River watershed in 2010 and projections of public-supply water use to 2040: U.S. Geological Survey Scientific Investigations Report 2018–5130, 62 p., https://doi.org/10.3133/sir20185130.