Maryland area codes

Maryland has 6 area codes: 227, 240, 301, 410, 443, 667.

• 227 — Washington
• 240 — Washington
• 301 — Washington
• 410 — Baltimore
• 443 — Baltimore
• 667 — Baltimore

Area codes by city in Maryland

• Baltimore area codes
• Annapolis area codes
• Frederick area codes
• Silver Spring area codes
• Hagerstown area codes
• Rockville area codes

Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.