| Costco White Marsh | Baltimore(410) 574-7563 | (410) 574-7563 |
| Costco BELTSVILLE | Beltsville(301) 902-2640 | (301) 902-2640 |
| Costco BRANDYWINE | Brandywine(301) 372-3200 | (301) 372-3200 |
| Costco COLUMBIA | Elkridge(410) 423-4052 | (410) 423-4052 |
| Costco Frederick | Frederick(301) 644-1483 | (301) 644-1483 |
| Costco Gaithersburg | Gaithersburg(301) 417-1500 | (301) 417-1500 |
| Costco Glen Burnie | Glen Burnie(410) 590-8603 | (410) 590-8603 |
| Costco ARUNDEL MILLS | Hanover(410) 379-3100 | (410) 379-3100 |
| Costco Woodmore Towne Centre | Lanham(301) 341-6740 | (301) 341-6740 |
| Costco WHEATON | Wheaton(301) 692-1330 | (301) 692-1330 |
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