Multi-Resolution Land Characteristics Consortium (MRLC) National Land Cover Database (NLCD) The Multi-Resolution Land Characterization (MRLC) consortium is a group of federal agencies who coordinate and generate consistent and relevant land cover information at the national scale for a wide variety of environmental, land management, and modeling applications.
There are datasets from 1992, 2001, 2006, and 2011. Many of these can also be downloaded from the National Map: viewer.nationalmap.gov
USGS Gap Analysis Program The GAP national land cover data, based on the NatureServe Ecological Systems Classification, are the foundation of the most detailed, consistent map of vegetative associations ever available for the United States
Cropland Data Layer The USDA NASS Cropland Data Layer (CDL) is a raster, geo-referenced, crop-specific land cover data layer for the United States.
Bureau of Land Management Navigator GeoCommunicator provides searching, accessing and dynamic mapping of the following BLM activities:
-Oil and Gas lease sale parcels
-BLM National Mine Land Inventory for BLM Coal and Non-coal Abandoned Mines
-BLM Lands and Administrative Areas
-BLM National Monuments, Conservation Areas, and Wilderness Areas
-BLM Range Allotments and Pastures
-BLM Wild Horse and Burro Herd Areas and Herd Management Areas
-BLM Solar Energy Study Areas
-Public Land Survey System - PLSS (township, range, section, lots, surveys) - Downloadable
National Wetlands Inventory A variety of data and reports related to wetlands
Land Cover Institute (LCI) Data A list of sources of land cover data