U.S. Access Board - This agency wrote the Americans with Disabilities Act Accessibility Guidelines(ADAAG).
http://www.access-board.gov/
U.S. Department of Justice, Office of Civil Rights - This agency adopts regulations and enforces the ADA.
http://www.usdoj.gov/crt/ada/adahom1.htm
U.S. Housing and Urban Development (HUD) - This agency wrote the Fair Housing Amendment Act (FHAA) and enforces its implementation.
http://fairhousingfirst.org/
http://www.hud.gov/offices/fheo/FHLaws/index.cfm
The Southwest ADA Center, based in Houston, provides research, education, consultation and training in areas of Independent Living Research Utilization.
http://www.dlrp.org
Below is a direct link and brief description of each agency.
http://www.newmexico.gov/government.php