A soil-water balance model (SWB) was developed to estimate potential recharge and irrigation water demand from the groundwater flow system in Florida and parts of Georgia, Alabama, and South Carolina for the period 1895 through 2010. This SWB model executable code detailed in the report SWB—A Modified Thornthwaite-Mather Soil-Water-Balance Code for Estimating Groundwater Recharge; Chapter 31 of Section A, Groundwater, of Book 6, Modeling Techniques By S.M. Westenbroek, V.A. Kelson,W.R. Dripps,R.J. Hunt, and K.R. Bradbury (https://pubs.usgs.gov/tm/tm6-a31/) The SWB model was not calibrated; however, various water budget components from the model output compared reasonably well with other estimates including irrigation pumpage quantities reported by the States of Florida and Georgia. Irrigation water demand for 6 crop types (citrus, field crops, hay, sod, sugar cane, and vegetables) were calculated for the period 1950-2010. This USGS data release contains all of the input and output files except climate data for the simulations described in this data release. Due to size limitations climate data used in the production of this model are not included in this archive, URLs to locate the climate data are included.