Key Autism Services LLC Share: Pediatric Subspecialty Clinic Key Autism Services LLC Visit Website Request Info 4427 Hwy. 6, Ste. L Sugar Land, TX 77478-4516 (857)825-4040 x. 122 (844) 965-9105 (fax) LinkedIn Facebook Instagram Hours: Monday through Friday 8:00 am - 7:00 pm About Map About Key Autism Services provides Applied behavior analysis (ABA) services to bring about meaningful and positive change to those diagnosed with Autism. What's Nearby? Distance: 5 10 15 20 25 50 mi.