781 Area Code 🌍☎️

The most populous cities in area code 781 are: Boston, Waltham, Cambridge, Lexington, and Lynn.

Other cities in the 781 area code include: Burlington, Dedham, Needham, Woburn, Braintree, East Weymouth, Rockland, Revere, Canton, Norwood, Medford, Malden, Randolph, Stoughton, Kingston, Wakefield, Wellesley Hills, Reading, Winchester, Arlington, Norwell, Hingham, Marshfield, Saugus, Hanover, Sharon, Stoneham, Needham Heights, Lynnfield, Charlestown, Marblehead, Scituate, Whitman, Hanson, Melrose, Lowell, Dorchester, Hull, Duxbury, Cohasset, Lincoln, Hanscom Afb, Acton, Waban, South Walpole, Brockton, and Framingham.

Nickname(s): See Boston nicknamesMotto: Sicut patribus sit Deus nobis (Latin) "As God was with our fathers, so may He be with us"Boston (pronounced Listen i / ˈ b ɒ s t ən / BOSS -tən) is the capital and most populous city of the Commonwealth of Massachusetts in the United States. Boston is also the seat of Suffolk County, although the county government was disbanded on July 1, 1999. The city proper covers 48 square miles (124 km 2) with an estimated population of 667,137 in 2015, making it the largest city in New England and the 23rd most populous city in the United States. The city is the economic and cultural anchor of a substantially larger metropolitan area known as Greater Boston, a Metropolitan Statistical Area (MSA) home to a census-estimated 4.7 million people in 2014 and ranking as the tenth-largest such area in the country. Alternately, as a Combined Statistical Area (CSA), this wider commuting region is home to some 8.1 million people, making it the sixth-largest as such in the United States. One of the oldest cities in the United States, Boston was founded on the Shawmut Peninsula in 1630 by Puritan settlers from England. It was the scene of several key events of the American Revolution, such as the Boston Massacre, the Boston Tea Party, the Battle of Bunker Hill, and the Siege of Boston. Upon U.S. independence from Great Britain, it continued to be an important port and manufacturing hub as well as a center for education and culture. Through land reclamation and municipal annexation, Boston has expanded beyond the original peninsula. Its rich history attracts many tourists, with Faneuil Hall alone drawing over 20 million visitors per year. Boston's many firsts include the United States' first public school, Boston Latin School (1635), first subway system, the Tremont Street Subway (1897), and first public park, Boston Common (1634).The area's many colleges and universities make Boston an international center of higher education, including law, medicine, engineering, and business, and the city is considered to be a world leader in innovation and entrepreneurship with nearly 2,000 startups. Boston's economic base also includes finance, professional and business services, biotechnology, information technology, and government activities. Households in the city claim the highest average rate of philanthropy in the United States; businesses and institutions rank among the top in the country for environmental sustainability and investment. The city has one of the highest costs of living in the United States as it has undergone gentrification, though it remains high on world livability rankings.

Waltham is a city in Middlesex County, Massachusetts, United States, and was an early center for the labor movement as well as a major contributor to the American Industrial Revolution. The original home of the Boston Manufacturing Company, the city was a prototype for 19th century industrial city planning, spawning what became known as the Waltham-Lowell system of labor and production. The city is now a center for research and higher education, home to Brandeis University and Bentley University. The population was 60,636 at the census in 2010. Waltham is commonly referred to as Watch City because of its association with the watch industry. Waltham Watch Company opened its factory in Waltham in 1854 and was the first company to make watches on an assembly line. It won the gold medal in 1876 at the Philadelphia Centennial Exposition. The company produced over 35 million watches, clocks and instruments before it closed in 1957.

Cambridge is a city in Middlesex County, Massachusetts, and is a part of the Boston metropolitan area.Situated directly north of the city of Boston, across the Charles River, it was named in honor of the University of Cambridge in the United Kingdom, an important center of the Puritan theology embraced by the town's founders. :18 Harvard University and the Massachusetts Institute of Technology (MIT), two of the world's most prestigious universities, are located in Cambridge, as was Radcliffe College, one of the leading colleges for women in the United States until it merged with Harvard.According to the 2010 Census, the city's population was 105,162. As of July 2014 , it was the fifth most populous city in the state, behind Boston, Worcester, Springfield and Lowell. Cambridge was one of the two seats of Middlesex County prior to the abolition of county government in 1997; Lowell was the other.Kendall Square in Cambridge has been called "the most innovative square mile on the planet", in reference to the high concentration of entrepreneurial start-ups and quality of innovation which have emerged in the vicinity of the square since 2010.

The 781 area code lies within the Eastern Daylight Time Zone (or EDT). The current time in Eastern Daylight Time is 07:23 AM on Mar 10, 2026.