McHenry County Extension
- Extension is the University of Illinois' outreach to the local people, providing provides practical research-based information to make a positive difference in people's lives. Includes overview of programs, including 4-H, camps, gardening, and nutrition.
- http://web.extension.uiuc.edu/mchenry/

Cary - Grove Historical Society
- Preserves, promotes and presents artifacts relating to the history of the Cary and Fox River Grove area.
- http://www.caryarea.info/cghs/

Wonder Lake Senior Citizens' Club
- Comprised of seniors, ages 55 and older, residing in Wonder Lake, McHenry, Johnsburg and Woodstock. Offers activities, events, and membership information.
- http://www.wonderlakeseniors.org/

McHenry County Pride
- Discussion and social group for gay, lesbian, bisexual and transgendered adults.
- http://www.mchenrypride.org/