Do you work and need childcare OR are you a SAHP so want socialization but not childcare for him?
If you want socialization and you are a SAHP then you can do playgroups with children his age - if you can meet parents. make a concerted effort when at playgrounds to reach out to parents with children approximately his age and start to get to know them, then invite them to your house for a playdate. At this age, 2 children interacting side by side is great! He'll start interacting with children, and doing more cooperative play, as he gets closer to 3 years of age.
Perhaps if you took a Music together class, you would meet parents of children around his age to get to know and start inviting to your house, maybe you could participate in a small weekly playdate with 5 children and their parents at rotating homes.
IF you are a WOHP and you need childcare, you'll need to get a nanny who can do all those things, can have your child eventually attend PEP (at 3 years of age) if he qualifies, etc.
Perhaps for childcare you could instead find a family childcare (someone in their home) who has a small group of children - this might work well. Of course some of the children would be much younger, but there wouldn't be any older, and he's not ready to interact with 3's and 4's probably. Far better to have 18 to 27 month olds, since he's more at that stage right now.
Child Find is for all of Maryland, each county has it's own Child Find phone # so in MoCo's Infants and Toddlers is at this link:
http://www.montgomeryschoolsmd.org/departments/special-education/programs-services/infants-and-toddlers.aspx
From their website: Montgomery County Infants and Toddlers Program (MCITP)
MCITP provides early intervention services to assist families with their efforts to address their children's developmental and special needs. MCITP serves families with children between birth and the beginning of the school year following the fourth birthday. Families and early intervention providers work as a team to define priorities, learn about available resources and discuss the child's strengths and needs.
Early intervention services are provided in the child's natural environment (home and community settings where a child is during the day). The following may be provided based on each individual child's and family’s needs:
Assistive Technology
Audiology
Interpreting
Family counseling
Family support
Family training
Nursing
Nutritional counseling
Occupational therapy
Physical therapy
Psychological testing
Services for visual impairment
Services for hearing impairment
Social work
Special instruction
Speech/language therapy
Transportation