Community Council of St. Charles County
- Serves as a clearinghouse for the county's health and social welfare agencies. Includes information about volunteer opportunities and initiatives in nonprofit development, hunger, homelessness, housing, and other priority areas.
- http://www.communitycouncilstc.org

Community Living, Inc.
- Provides residential, respite, recreation, employment and adult day services for people with disabilities.
- http://www.cliservices.org

Vision St. Charles County Leadership Program
- Educates local leaders about public policy and social issues.
- http://www.visionleadership.org/

Genealogy Web Archives
- St. Charles County, Missouri.
- http://www.rootsweb.com/~usgenweb/mo/stcharles/stcharles.htm

Missouri Census
- St. Charles County, Missouri.
- http://www.oseda.missouri.edu/mscdc/census/us/basictables/us.text/county/MO/MOSTCHAR

National Register of Historical Places
- Saint Charles County, Missouri.
- http://www.nationalregisterofhistoricplaces.com/MO/St%2E+Charles/state.html