- Aberdeen
- Annapolis
- Baltimore
- Bel Air
- Beltsville
- Berlin
- Bethesda
- Bowie
- California
- Cambridge
- Capitol Heights
- Catonsville
- Chester
- Chestertown
- Cheverly
- Chevy Chase
- Clinton
- Cockeysville
- College Park
- Columbia
- Cumberland
- Denton
- Dundalk
Note: Direct to consumer drug testing services are unavailable to Maryland residents.