This data release contains inputs for and outputs from hydrologic simulations for Puerto Rico using the Precipitation Runoff Modeling System (PRMS) version 5.2.1, the USGS National Hydrologic Model infrastructure (NHM, Regan and others, 2018), National Hydrologic Geospatial Fabric version 1.0 (Viger and Bock, 2014), and the Daymet version 4 (Thornton et. al., 2020) atmospheric forcing dataset. These simulations were developed to provide estimates of the water budget for the period 1950 to 2021. The model parameters and associated model output included in this data release are described in Swain and Bellino (2022). Specific data included are: 1) model input files, 2) output files of simulated water budget components for each hydrologic response unit (HRU) and stream segment, and 3) performance statistics at selected streamgage locations. The first three years of the simulations are considered 'model initialization' and should not be included in any subsequent analysis. Model input files, located on the “ Input Data for Hydrologic Simulations of Puerto Rico using the NHM-PRMS, 1950-2021, Daymet version 4” child page, include ASCII formatted PRMS input files of 1) daily time step atmospheric forcings of minimum air temperature (tmin.day), maximum air temperature (tmax.day), precipitation accumulation (precip.day), and humidity (humidity.day), 2) PRMS model parameters (NHM-PRMS.param), 3) a PRMS control file that provides the simulation configuration information (NHM-PRMS_data_release.control), 4) and the PRMS data file that includes time series of streamflow observations (sf_data). Descriptions of model input parameters are included in the parameters_data_dictionary.csv file on this main page. Descriptions of control file parameters are included in the control_data_dictionary.csv file on this main page. Additional information about the model calibration and associated parameters is provided in Swain and Bellino (2022). Model output files, located on the “Output Data for Hydrologic Simulations of Puerto Rico using the NHM-PRMS, 1950-2021, Daymet version 4” child page, include 18 PRMS output variables for the model simulation. Each NetCDF format output file contains daily time step outputs for the period 1950-2021 for each hydrologic response unit or stream segment in the model application. Descriptions of model output variables are included in the output_variables_data_dictionary.csv file on this main page. Streamflow statistics of model performance at selected streamgages are located on this main page (gage_stats_pr.csv).