An annotated checklist of the fleas of Maryland is presented. Previous records are reviewed and new records listed including four new state records and 40 new county distribution records. The new additions to the Maryland flea fauna are all in family Ctenophthalmidae: Catallagia borealis Ewing, 1929; Conorhinopsylla stanfordi Stewart, 1930; Epitedia cavernicola Traub, 1957; Tamiophila grandis (Rothschild, 1902). The number of flea species known to occur in Maryland is now 31.