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McHenry County Illinois Genealogy and History

Founded: January 16th, 1836

Named for: William McHenry

County Seat: Woodstock

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Search Free McHenry County, Illinois Genealogy and Family History Records Online including census, cemetery, vital, military and other genealogical and historical records that can be used for your family history research.

McHenry County, Illinois genealogy and family history page is a place where you can come in and research your genealogy and family history. We also do our best to provide a history of the area, to provide you with an overview of the time in which your ancestors lived.

We regret that we are unable to do personal research for you. All genealogical and family history records we come across are being added to this website. Please keep checking back.


Cities: Crystal Lake, Harvard, Marengo, McHenry, Woodstock (county seat)

Villages: Algonquin (mostly), Barrington Hills (part), Bull Valley, Cary, Fox Lake (part), Fox River Grove (part), Greenwood, Hebron, Holiday Hills, Huntley (part), Island Lake (part), Johnsburg, Lake in the Hills, Lakemoor (part), Lakewood, McCullom Lake, Oakwood Hills, Port Barrington (part), Prairie Grove, Richmond, Ringwood, Spring Grove, Trout Valley, Union, Wonder Lake

Census-designated places: Alden, Big Foot Prairie, Burtons Bridge, Chemung, Coral, Franklinville, Harmony, Hartland, Lawrence, Pistakee Highlands, Ridgefield, Riley, Solon Mills

Before the 2020 Census, only Chemung and Pistakee Highlands were CDPs.

Unincorporated communities: Belden, Palm Beach (part), Silver Lake, Terra Cotta

Townships: Alden, Algonquin, Burton, Chemung, Coral, Dorr, Dunham, Grafton, Greenwood, Hartland, Hebron, Marengo, McHenry, Nunda, Richmond, Riley, Seneca

McHenry County Genealogy Records

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Adjacent counties