Existing simulated groundwater head and water-budget output files from MODFLOW models for the Plymouth-Carver region (Masterson and others, 2009), the Hyannis Ponds Cape model (LeBlanc and others, 2019), and a SEAWAT model of lower Cape Cod (Masterson, 2004) were used in a new MODPATH version 6 (MP6) (Pollock, 2012) particle-tracking analyses. In the MODPATH6 analyses, endpoints associated with unique hydrologic receptors (model cells representing streams or drains, and ponds) were identified by forward tracking the particles through the simulated hydrologic system represented by each of the groundwater models. Each endpoint file is included in this data release. Shapefiles containing the unique zone identifier for each stream, drain, and pond model-grid-cell, also are included. Ultimately, the groupings found in each endpoint file were used to define areas contributing recharge, or contributing area, for each stream cell, drain cell, and pond in contact with a stream in the model area. This USGS data release contains the input and output files (https://doi.org/10.3133/sir2024xxxx). (See cross reference section of this metadata for full citation information).