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Federal
Population Estimates: Population Estimates
Department of Commerce —
Annual Population Estimates for the United States, States, Metropolitan Statistical Areas, Micropolitan Statistical Areas, Counties, Incorporated Places, and Minor... -
Federal
USDA Plant Hardiness Zone Map (PHZM)
Department of Agriculture —
The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is... -
Federal
Arctic Water Vapor Characteristics from Rawinsondes, Version 1
National Aeronautics and Space Administration —
A gridded climatological monthly-mean data base of Arctic water vapor characteristics has been assembled by combining fixed station data with data from soundings...