- 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.
- Collin County Texas Index of Landmarks and Vanished Communities - Location information for landmarks and vanished communities in the county.
- 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.
- Allen@ (80)
- Anna@ (9)
- Blue Ridge@ (5)
- Celina@ (11)
- Copeville@ (2)
- Fairview@ (10)
- Farmersville@ (10)
- Frisco@ (129)
- Frognot@ (0)
- Lavon@ (3)
- Lowry Crossing@ (2)
- Lucas@ (11)
- McKinney@ (118)
- Melissa@ (5)
- Murphy@ (14)
- Nevada@ (4)
- New Hope@ (3)
- Parker@ (4)
- Plano@ (335)
- Princeton@ (8)
- Prosper@ (6)
- Richardson@ (144)
- Sachse@ (12)
- Saint Paul@ (1)
- Westminster@ (3)
- Weston@ (3)
- Wylie@ (47)