National History Day
http://www.nationalhistoryday.org/

National History Day State Coordinators
http://www.nhd.org/Coordinators.htm

National Archives and Records Administration
http://www.archives.gov/education/history-day/index.html

Library of Congress, National Digital Library
http://memory.loc.gov/ammem/ndlpedu/resources/histday/index.html

Alabama History Day, Auburn University, Montgomery
http://www.alsde.edu/html/sections/History_Day.asp?section=54&footer=sections

Idaho State Historical Society
http://www.idahohistory.net/historyday.html

State Historical Society of Iowa
http://www.iowahistory.org/education/history_day/index.html

Kansas State Historical Society
http://www.kshs.org/teachers/historyday/

Maine State Archives
http://www.maine.gov/sos/arc/historyday/histhome.htm

Massachusetts Commonwealth Museum and Archives
http://www.sec.state.ma.us/mus/happenings/historyday/historyday.htm

Minnesota Historical Society
http://www.mnhs.org/school/historyday/index.html

Nebraska State Historical Society
http://www.nebraskahistory.org/museum/teachers/material/history_day.htm

North Carolina Division of Archives and History
http://www.ah.dcr.state.nc.us/edu-outrch/historyday.html

Ohio Historical Society
http://www.ohiohistory.org/resource/edserv/ohd/index.html

Oklahoma Department of Libraries, State Archives Division
http://www.odl.state.ok.us/oar/index.htm

South Carolina Department of Archives and History
http://www.state.sc.us/scdah/nathstdy.htm

Wisconsin Historical Society
http://www.portalwisconsin.org/historyday.cfm

Wyoming History Day
American Heritage Center, University of Wyoming
http://uwadmnweb.uwyo.edu/ahc/historyday/default.htm