Developmental Disabilities Institute (DDI)

Address: 99 Hollywood Drive,
Smithtown,, NY 11787
Phone: (631) 366-2900 Website:

Developmental Disabilities Institute (DDI) was founded in 1961, to address the special needs of children with Autism and other developmental disabilities, and provide therapeutic intervention. Today, DDI is a non-profit, multi-site agency serving over 1,500 children and adults with Autism and related disorders.


Our mission is to support children and adults with developmental disabilities in achieving a lifetime of growth through exceptional care and innovative, individualized service.



 Children Services

  • Educational
  • Community-Based
  • Respite
  • Residential

Adult Services

  • Residential
  • Day Habilitation

Family Support Services

  • Respite
  • Community Habilitation
  • Family Behavior Support Program
  • Intensive Behavioral Services

Vocational Services

  • Pre-Vocational Services
  • Supported Employment

Service Coordination


  • Locations/Maps, Directions



  • Children's Day Program
  • Starting Early Program
  • Young Autism Program


  • Special Events
  • Annual Golf Classic
  • Rockin' for Autism
  • Stars Gala & Casino Night
  • Walk in the Park & Family Picnic


Please visit our website or Contact us for more information:


DDI Program Site Locations


DDI Residential Site Locations


DDI Office Location:

Was Your Child's CP Preventable?