Genealogy websites in U.S. classified per State.

Alabama:
Alabama Genealogy Society: http://algensoc.org/
AncestryProGenealogists: https://www.progenealogists.com/
Alaska:
Alaska State Archives: https://archives.alaska.gov/
The Genealogy Center: http://www.wasillapubliclibrary.org/genealogy/
Arizona:
Arizona Genealogy Society: https://azgenealogy.org/
Genealogy Today: https://www.genealogytoday.com/
Arkansas:
Arkansas Genealogical Society: https://www.agsgenealogy.org/
Family Tree DNA: https://www.familytreedna.com/
California:
California Genealogical Society & Library: https://californiaancestors.org/
GenealogyBank: https://www.genealogybank.com/
Colorado:
Colorado Genealogical Society: https://cogensoc.us/
Legacy Tree Genealogists: https://legacytree.com/
Connecticut:
Connecticut Ancestry Society: https://www.connecticutancestry.org/
NEHGS (New England Historic Genealogical Society): https://www.americanancestors.org/
Delaware:
Delaware Genealogical Society: https://delgensoc.org/
MyHeritage: https://www.myheritage.com/
Florida:
Florida State Genealogical Society: https://flsgs.org/
FamilySearch: https://www.familysearch.org/
Georgia:
Georgia Genealogical Society: https://www.gagensociety.org/
Ancestry.com: https://www.ancestry.com/
Hawaii:
Hawaii State Archives: https://ags.hawaii.gov/archives/
Findmypast: https://www.findmypast.com/
Idaho:
Idaho Genealogical Society: https://idahogenealogy.org/
DNA Consultants: https://dnaconsultants.com/
Illinois:
Illinois State Genealogical Society: https://ilgensoc.org/
AncestryProGenealogists: https://www.progenealogists.com/
Indiana:
Indiana Genealogical Society: https://www.indgensoc.org/
MyHeritage: https://www.myheritage.com/
Iowa:
Iowa Genealogical Society: https://iowagenealogy.org/
Family Tree DNA: https://www.familytreedna.com/
Kansas:
Kansas State Historical Society: https://www.kshs.org/
Legacy Tree Genealogists: https://legacytree.com/
Kentucky:
Kentucky Historical Society: https://history.ky.gov/
Ancestry.com: https://www.ancestry.com/
Louisiana:
Louisiana Historical Society: https://www.louisianahistoricalsociety.org/
GenealogyBank: https://www.genealogybank.com/
Maine:
Maine Genealogical Society: https://maineroots.org/
NEHGS (New England Historic Genealogical Society): https://www.americanancestors.org/
Maryland:
Maryland Genealogical Society: https://www.mdgensoc.org/
AncestryProGenealogists: https://www.progenealogists.com/
Massachusetts:
Massachusetts Genealogical Council: https://www.massgencouncil.org/
NEHGS (New England Historic Genealogical Society): https://www.americanancestors.org/
Michigan:
Archives of Michigan: https://www.michigan.gov/mhc/
Michigan Genealogical Council: https://mimgc.org/
Michigan Genealogical Society: https://mimgen.org/
Michigan Historical Center: https://www.michigan.gov/mhc/
Minnesota:
Minnesota Genealogical Society: https://mngs.org/
Minnesota Historical Society: https://www.mnhs.org/
Minnesota State Archives: https://www.sos.state.mn.us/archives/
Mississippi:
Mississippi Department of Archives and History: https://www.mdah.ms.gov/
Mississippi Genealogical Society: https://ms-gensociety.org/
Mississippi Historical Society: https://mississippihistory.org/
Missouri:
Missouri Digital Heritage: https://s1.sos.mo.gov/mdh/
Missouri Genealogical Society: https://mogensoc.org/
State Historical Society of Missouri: https://shsmo.org/
Montana:
Montana Genealogy Society: https://mtgsm.org/
Montana Historical Society: https://mhs.mt.gov/
Montana State Library: https://msl.mt.gov/
Nebraska:
Nebraska Genealogical Society: https://www.negs.org/
Nebraska State Historical Society: https://history.nebraska.gov/
Nebraska State Records Board: https://sos.nebraska.gov/state-records-board
Nevada:
Nevada Genealogical Society: https://www.nevadags.org/
Nevada Historical Society: https://www.nevadaculture.org/his/
Nevada State Library, Archives and Public Records: https://nsla.nv.gov/
New Hampshire:
New Hampshire Division of Historical Resources: https://www.nh.gov/nhdhr/
New Hampshire Historical Society: https://www.nhhistory.org/
New Hampshire State Library: https://www.nh.gov/nhsl/
New Jersey:
New Jersey Historical Society: https://www.jerseyhistory.org/
New Jersey State Archives: https://www.nj.gov/state/archives/
Genealogical Society of New Jersey: https://www.gsnj.org/
New Mexico:
New Mexico Genealogical Society: https://www.nmgs.org/
New Mexico Historic Preservation Division: http://www.nmhistoricpreservation.org/
New Mexico State Library: http://www.nmstatelibrary.org/
New York:
New York Genealogical and Biographical Society: https://www.newyorkfamilyhistory.org/
New York State Archives: https://www.archives.nysed.gov/
New York State Library: https://www.nysl.nysed.gov/
North Carolina:
North Carolina Genealogical Society: https://www.ncgenealogy.org/
North Carolina Historic Sites: https://historicsites.nc.gov/
North Carolina State Archives: https://archives.ncdcr.gov/
North Dakota:
North Dakota State Archives: https://www.history.nd.gov/archives/
North Dakota State Genealogical Society: https://www.ndgensoc.com/
State Historical Society of North Dakota: https://www.history.nd.gov/
Ohio:
Ohio Genealogical Society: https://www.ogs.org/
Ohio History Connection: https://www.ohiohistory.org/
State Library of Ohio: https://library.ohio.gov/
Oklahoma:
Oklahoma Genealogical Society: https://okgensoc.org/
Oklahoma Historical Society: https://www.okhistory.org/
Oklahoma State Archives: https://www.ok.gov/oar/
Oregon
The Oregon Genealogical Society, https://oregongs.org/
Family historians: Genealogical Forum of Oregon, https://gfo.org/
Educational settings: Oregon Historical Society, https://www.ohs.org/
Pennsylvania
Historical Society of Pennsylvania, https://hsp.org/
Family historians: Pennsylvania Historical and Museum Commission, https://www.phmc.pa.gov/
Educational settings: Pennsylvania State Archives, https://www.phmc.pa.gov/Archives/Pages/default.aspx
Rhode Island
Rhode Island Genealogical Society, http://rigensoc.org/
Family historians: Rhode Island Historical Society, https://www.rihs.org/
Educational settings: Rhode Island Historical Preservation and Heritage Commission, https://preservation.ri.gov/
South Carolina
South Carolina Genealogical Society, https://scgenealogy.org/
Family historians: South Carolina Historical Society, https://schistory.org/
Educational settings: South Carolina State Library, http://www.statelibrary.sc.gov/
South Dakota
South Dakota Genealogical Society, https://sdgs.org/
Family historians: South Dakota State Historical Society, https://history.sd.gov/
Educational settings: South Dakota State Archives, https://history.sd.gov/Archives/
Tennessee
Tennessee Genealogical Society, https://tngs.org/
Family historians: Tennessee State Library and Archives, https://sos.tn.gov/tsla
Educational settings: Tennessee Historical Society, https://www.tennesseehistory.org/
Texas
Texas State Genealogical Society, https://txsgs.org/
Family historians: Texas Historical Commission, https://www.thc.texas.gov/
Educational settings: Texas State Library and Archives Commission, https://www.tsl.texas.gov/
Utah
Utah Genealogical Association, https://utagenealogy.org/
Family historians: Utah State Archives, https://archives.utah.gov/
Educational settings: Utah Division of State History, https://history.utah.gov/
Vermont
Vermont Genealogy Library, https://vtgenlib.org/
Family historians: Vermont Historical Society, https://vermonthistory.org/
Educational settings: Vermont State Archives and Records Administration, https://sos.vermont.gov/archives-records/
Virginia
Virginia Genealogical Society, https://vgs.org/
Family historians: Virginia Historical Society, https://www.virginiahistory.org/
Educational settings: Library of Virginia, https://www.lva.virginia.gov/
Virginia:
Virginia Historical Society - www.virginiahistory.org
Virginia Genealogical Society - www.vgs.org
Library of Virginia - www.lva.virginia.gov
Virginia Department of Historic Resources - www.dhr.virginia.gov
Virginia Beach Genealogical Society - www.vbgsva.org
Washington:
Washington State Archives - www.sos.wa.gov/archives
Washington State Genealogical Society - www.wasgs.org
Eastern Washington Genealogical Society - www.ewgsi.org
Heritage Quest Research Library - www.hqrl.com
Seattle Genealogical Society - www.seattlegenealogicalsociety.org
West Virginia:
West Virginia Archives and History - www.wvculture.org/history
West Virginia Genealogical Society - www.wvgs.org
West Virginia State Museum - www.wvculture.org/museum
West Virginia Vital Registration Office - www.wvdhhr.org/bph/hsc/vital
Kanawha Valley Genealogical Society - www.rootsweb.ancestry.com/~wvkvgs
Wisconsin:
Wisconsin Historical Society - www.wisconsinhistory.org
Wisconsin State Genealogical Society - www.wsgs.org
Wisconsin Veterans Museum - www.wisvetsmuseum.com
Wisconsin State Vital Records Office - www.dhs.wisconsin.gov/vitalrecords
Wisconsin State Old Cemetery Society - www.wsocs.org
Wyoming:
Wyoming State Archives - wyoarchives.wyo.gov
Wyoming State Genealogical Society - www.wsgs.org
Wyoming State Museum - www.wyomuseum.state.wy.us
Wyoming Vital Records Services - www.health.wyo.gov/admin/vitalstatistics
Laramie County Genealogical Society - www.rootsweb.ancestry.com/~wylarami/LCGS.htm