- Aberdeen
- Annapolis
- Baltimore
- Bel Air
- Beltsville
- Berlin
- Bethesda
- Bowie
- California
- Cambridge
- Capitol Heights
- Catonsville
- Centreville DNA Testing
- Centreville Drug Testing
- Chester
- Chestertown
- Cheverly
- Chevy Chase
- Clinton
- Cockeysville
- College Park
- Columbia
- Cumberland
- Denton
- Dundalk
- Easton
- Edgewater
- Edgewood
- Eldersburg
- Elkridge
- Elkton
- Ellicott City
- Fallston
- Forest Hill DNA Testing
- Forest Hill Drug Testing
- Frederick
- Fulton DNA Testing
- Fulton Drug Testing
- Gaithersburg
- Gambrills
- Germantown
- Glen Burnie
- Glenn Dale
- Hagerstown
- Halethorpe
- Havre De Grace
- Huntingtown
- Hyattsville
- La Plata
- Lanham
- Laurel
- Lavale
- Lexington Park
- Linthicum Heights
- Linthicum
- Lutherville
- Millersville DNA Testing
- Millersville Drug Testing
- Mount Airy
- Nottingham
- Ocean City
- Olney
- Owings Mills
- Oxon Hill
- Pasadena DNA Testing
- Pasadena Drug Testing
- Phoenix
- Pikesville
- Pocomoke City
- Prince Frederick
- Randallstown
- Rockville
- Rosedale
- Salisbury
- Severna Park
- Silver Spring
- Stevensville
- Timonium
- Towson
- Upper Marlboro
- Waldorf
- Westminster
- White Marsh
- White Plains DNA Testing
- White Plains Drug Testing
Note: Direct to consumer drug testing services are unavailable to Maryland residents.