- Butterflies of Collin County, Texas - Information about and pictures of all the known species of butterflies in the county.
- Collin County Law Enforcement Academy - General information plus class schedules and on-line registration.
- Collin County Psychological Association - Provides information to both Psychologists and people needing their services.
- Collin County Station - Offering details of local businesses, tourism, news and weather, events calendar and forums.
- Handbook of Texas Online: Collin County - Current and historical information about the county.
- League of Women Voters of Collin County - Non-partisan organization encouraging informed and active participation of citizens in government.
- Native Plant Society of Texas: Collin County Chapter - Includes contact information and a schedule of meetings.
- North Texas Orthodontic Associates, P.A. - Orthodontists offering an alternative to braces. Includes additional treatments, financial information, on-line patient forms and locations.
- Prairie and Timbers Audubon Society - Chapter of the National Audubon Society, located in McKinney, Texas.
- Rape Crisis Center of Collin County - Information on the effects of all types of sexual assault, and the services that the center provides. All information is available in English and Spanish.
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