General Interest
- DCNR Open Data - https://data-dcnr.opendata.arcgis.com/
- NHGIS - https://www.nhgis.org/
- Pennsylvania Spatial Data Access - http://www.pasda.psu.edu/
- PennDOT Open Data - https://data-pennshare.opendata.arcgis.com/
- Texas Natural Resource information System (TNRIS), Data & Maps - https://www.tnris.org/maps-and-data/
- U.S. Census Tiger Data - https://www.census.gov/geo/maps-data/data/tiger-geodatabases.html
- USDA Data Portal - https://datagateway.nrcs.usda.gov/GDGOrder.aspx
- USGS Store - http://store.usgs.gov/
- USGS National Map Data Download:
- http://viewer.nationalmap.gov/viewer/
- World Wide Data - http://www.gadm.org/country
