State · 6 area codes

Maryland area codes

Maryland has six area codes in two statewide overlay complexes: 301/240/227 and 410/443/667.

A · Metros

Major metro areas

Baltimore Silver Spring Frederick Rockville

B · Directory

Every code opens its profile — codes with a full write-up show their place; the rest show live numbering data while their detailed profile is added.

227 240 301 410 443 667

Sources

List of Maryland area codes (secondary)

Compiled by North American Numbers, last checked 2026-09-19. How this is made.