CLIA laboratories in Maryland
5,105 laboratories hold an active CLIA certificate in Maryland in the CMS file for Q2 2026 (latest record: Jun 29, 2026).
Credentialing a laboratory, checking a claim or a contract? A dated CLIA certificate report ($19) — or a whole list checked at once.
By certificate type
| Certificate | Active laboratories |
|---|---|
| Certificate of Waiver | 4,034 |
| Certificate for Provider-Performed Microscopy (PPM) | 543 |
| Certificate of Compliance | 262 |
| Certificate of Accreditation | 220 |
| Certificate of Registration | 46 |
By facility type
By city
- Aberdeen — 20
- Annapolis — 133
- Arnold — 17
- Baltimore — 650
- Bel Air — 78
- Beltsville — 16
- Berlin — 28
- Bethesda — 109
- Bowie — 72
- Brandywine — 12
- California — 13
- Cambridge — 26
- Camp Springs — 10
- Capitol Heights — 14
- Catonsville — 41
- Centreville — 12
- Chester — 10
- Chestertown — 28
- Chevy Chase — 49
- Clinton — 29
- Cockeysville — 15
- College Park — 13
- Columbia — 147
- Crofton — 15
- Crownsville — 11
- Cumberland — 55
- Denton — 14
- Dundalk — 25
- Dunkirk — 12
- Easton — 58
- Edgewater — 18
- Eldersburg — 22
- Elkridge — 23
- Elkton — 58
- Ellicott City — 41
- Forest Hill — 15
- Fort Washington — 20
- Frederick — 192
- Fulton — 13
- Gaithersburg — 103
- Gambrills — 16
- Germantown — 73
- Glen Burnie — 100
- Glenn Dale — 10
- Greenbelt — 58
- Hagerstown — 129
- Hampstead — 10
- Hanover — 18
- Havre De Grace — 21
- Hunt Valley — 13
- Hyattsville — 41
- Kensington — 11
- La Plata — 23
- Lanham — 42
- Laplata — 12
- Largo — 26
- Laurel — 71
- Leonardtown — 27
- Lutherville — 52
- Millersville — 11
- Mount Airy — 18
- North Bethesda — 10
- Nottingham — 25
- Oakland — 26
- Odenton — 24
- Olney — 35
- Owings Mills — 55
- Oxon Hill — 37
- Parkville — 14
- Pasadena — 36
- Pikesville — 24
- Potomac — 19
- Prince Frederick — 37
- Princess Anne — 10
- Randallstown — 22
- Reisterstown — 16
- Riverdale — 10
- Rockville — 212
- Rosedale — 22
- Salisbury — 105
- Severna Park — 23
- Silver Spring — 166
- Sykesville — 11
- Takoma Park — 15
- Timonium — 26
- Towson — 97
- Upper Marlboro — 26
- Waldorf — 61
- Westminster — 73
- Wheaton — 18
- White Plains — 18
- Windsor Mill — 16
Smaller places of Maryland — 511 laboratories.
City counts are the laboratories listed on this site; 286 more in Maryland carry only a person's name and are found by search.