Area Code 410 History - Maryland

Significant events for area code 410


Year
Details
1991 Area code 301 was split with 410 covering eastern Maryland north of the Washigton D.C. area. 301 continued to cover the Washington D.C. area and western Maryland.
1997 Area code 443 was overlaid on 410.
2012 Area code 667 was overlaid on 410 and 443 .