Heritage Learning Center
- Provides quality child care for ages 18 months through 6th grade. Includes after-school program with a variety of fun activities.
- http://www.hlc.info/

McKinney Area Christian Homeschoolers
- A cooperative fellowship of families who homeschool one or more of their children.
- http://www.marchgroup.org/

McKinney H.S. 1974
- reunions
- http://www.reunionsworld.com/SchoolAnnouncements/Texas/McKinneyTX74.htm

Medallion
- offers educational program, before and after school program, early education and recreational program for school-aged children, elementary schools
- http://www.medallionsp.com/

McKinney Education Foundation
- A publicly supported charity whose purpose is to provide perpetual funds that directly benefit McKinney Independent School District students and teachers.
- http://www.mckinneyisd.net/mef/