301 Area Code: Location, Time Zone & Phone Lookup

Area Code 301 Overview

Area code 301 is one of the original 86 area codes created by the North American Numbering Plan (NANP) in 1947. It covers central Maryland, including the Baltimore metropolitan area. 301 is a relatively small area code, with just over 2 million people in it. It's one of the most densely populated areas in the country, and one of the most expensive for phone companies to serve. This has led to numerous area code splits and overlays in recent years.

Despite the area code's small size, it's home to some of the most important companies and institutions in the country. The National Institutes of Health, Johns Hopkins University, and Lockheed Martin are all located in 301.

Area Code 301 History

301 area code historyThe 301 area code was one of the original area codes established in 1947. It originally served the entire state of Maryland.

In 1957, the 301 area code was split, and the western portion became the new area code 240. The eastern portion of 301 continued to serve the entire state of Maryland.

In 1991, the 301 area code was split again, and the western portion became the new area code 410. The eastern portion of 301 continued to serve the entire state of Maryland.

In 1997, the 301 area code was split again, and the eastern portion became the new area code 410. The western portion of 301 became the new area code 240.

In 2001, the 301 area code was split again, and the eastern portion became the new area code 240. The western portion of 301 became the new area code 301.

In 2009, the 301 area code was split again, and the eastern portion became the new area code 240. The western portion of 301 became the new area code 301.