When you say your son is "delayed in speech," has he been evaluated by a licensed speech-language pathologist (SLP)?  We ask because your child may actually NOT be delayed, and an SLP would really need to make that determination.  

If, however, your child has been seen by an SLP, simply contact the school in your area to find out more information on having your child receive speech therapy.  In general, individuals ages 3-21 are entitled to receive services through the schools if they have a speech delay according to the state's established guidelines.  Again, your area school should be able to direct you accordingly.