Collin County Historic Preservation Group: Promotes the preservation the historical heritage of Collin County and North Texas. Includes events, newsletters, meetings, and publication.
Collin County, Texas Genealogy: Volunteers do lookups as a courtesy for individuals seeking information on their ancestors. Provides message boards and links to other resources.
Democratic Party of Collin County: Official site. Includes information on events and fundraisers.
North Collin County Genealogical Society: Official site of the society, which is based in McKinney, Texas.
North Collin Habitat for Humanity: Christian nonprofit building affordable homes. How it works, information on volunteering or donating, and descriptions of future projects.
The Collin County Genealogical Society: Official site of the society, which is based in Plano, Texas.
The Political Graveyard: Collin County, Tex.: Information about politicians who were born or died in Collin County.