351 Area Code – Lowell, Massachusetts: Location, Time Zone & History

Lowell's telephone numbering history traces back to the creation of area code 978, which split off from area code 508 in 1997 to cover north-central and northeastern Massachusetts. Four years later, on May 2, 2001, 351 was introduced as an overlay on that same 978 territory, adding capacity without redrawing any boundaries and making ten-digit dialing mandatory across the region.

Lowell itself carries significant historical weight: it was a major center of the American Industrial Revolution, and its textile-mill heritage is preserved today at Lowell National Historical Park. The broader 351 territory also reaches Lawrence, Haverhill, Peabody, Fitchburg, and Leominster, a cluster of former mill cities that shaped the industrial development of the state.

Present-day economic activity in the area spans higher education, healthcare, manufacturing, technology, and retail, reflecting a gradual shift from the region's industrial past toward a more diversified service and knowledge economy. That evolution mirrors the numbering plan itself, which moved from a single geographic code to an overlay structure in order to keep pace with growth without redrawing the map.