Highway Access

MD Route 2 connects with U.S. 50/301; MD Route 4 connects with U.S. 301 and the Capital Beltway (I-495). The Thomas Johnson Bridge over the Patuxent River connects MD Routes 2/4 in the southern part of the county with MD Routes 5/235 in St. Mary's County.

Traffic Volume Maps

View the Maryland Department of Transportation's Traffic Volume Maps by County.


Calvert County is served by 3 major airports:

  • Baltimore-Washington International (BWI) Thurgood Marshall Airport is located between Baltimore and Washington, D.C.
  • Dulles International Airport (IAD) is located west of Washington, D.C.
  • Reagan Washington National Airport (DCA) is located adjacent to Washington, D.C.

Calvert County also has one local airport, St. Mary's County Regional Airport, which is located southeast of Washington, D.C.

Travel Time
Contact Information 
Baltimore-Washington International (BWI)
1 hour, 6 minutes
Dulles International (IAD)
1 hour, 25 minutes
Reagan Washington National (DCA)
51 minutes
St. Mary's County Regional
45 minutes


Calvert is served by one of the nation's largest seaports, The Port of Baltimore, with a 50-foot channel (64 miles from Prince Frederick). It is the only port in the United States that can be reached by 2 distinct routes. Its sea lanes remain ice-free throughout the year. It is a leading U.S. automobile and break-bulk port with six public terminals including the state-of-the-art Intermodal Container Transfer Facility (ICTF).


The closest rail depot (CSXT) is in adjacent Prince George's County at Upper Marlboro, approximately 30 minutes away.