Braintree (US: ), officially the Town of Braintree, is a city in Norfolk County, Massachusetts, United States. It is officially known as a town, but Braintree is a city with a mayor–council form of government, and it is considered a city under Massachusetts law. The population was 39,143 at the 2020 census. It is part of the Greater Boston area, with access to the MBTA Red Line, and is a member of the Metropolitan Area Planning Council's South Shore Coalition. The first mayor of Braintree was Joe Sullivan, who served until January 2020. The current mayor of Braintree is Erin Joyce, who was elected in 2023, defeating incumbent Charles Kokoros.
Braintree was colonized in 1635 and incorporated in 1640. The town is named after the Essex town of Braintree. Its original area split to form the municipalities of Quincy (incorporated in 1792) and Randolph (incorporated in 1793) in the late eighteenth century, after which Randolph split to form the municipality of Holbrook (incorporated in 1872) eight decades later. Braintree was part of Suffolk County until the formation of Norfolk County in 1793.
In 1888, the villages of Braintree and South Braintree were separate communities within the town of Braintree.
In 1920, Braintree was the site of the murders that led to the trial of Sacco and Vanzetti. During that same decade, the town's population grew by more than 50%.
In the period after World War II, several Irish American and Italian American families living in lower income portions of Boston moved to Braintree.
Braintree shares borders with Quincy to the north, Randolph to the west (separated by the Cochato River), Holbrook to the south, and Weymouth to the east.
According to the U.S. Census Bureau, the town has a total area of 14.5 square miles (37.6 km2), of which 13.9 square miles (36.0 km2) is land and 0.6 sq mi (1.6 km2) is water. The total area is 4.34% water.
Park and recreation locations in Braintree include Pond Meadow Park, Sunset Lake, and Blue Hills Reservation.
Braintree has a humid continental climate (Köppen Dfa) with some maritime influence. Summers are typically warm to hot, rainy, and humid, while winters oscillate between periods of cold rain and snow, with cold temperatures. Spring and fall are usually mild, with varying conditions dependent on wind direction and jet stream positioning. Prevailing wind patterns that blow offshore minimize the influence of the Atlantic Ocean.
The hottest month is July, with a mean temperature of 69.7 °F (20.9 °C). The coldest month is January, with a mean of 25.7 °F (−3.5 °C). Periods exceeding 90 °F (32 °C) in summer and below freezing in winter are not uncommon but are rarely extended, with about 13 and 25 days per year seeing each, respectively. The city's average window for freezing temperatures is November 9 through April 5. Official temperature records have ranged from −21 °F (−29 °C) in February 1934, up to 101 °F (38 °C) in August 1949 and 1974.
Braintree's coastal location on the North Atlantic moderates its temperature, but makes the city very prone to nor'easter weather systems that can produce much snow and rain. The city averages 48.63 inches (1,240 mm) of precipitation a year, with 61.1 inches (155 cm) of snowfall per season. Snowfall increases dramatically as one goes inland away from the city (especially north and west of the city)—away from the moderating influence of the ocean.
Most snowfall occurs from December through March, as most years see no measurable snow in April and November, and snow is rare in May and October. There is also high year-to-year variability in snowfall; for instance, the winter of 2011−2012 saw only 24.2 in (61.5 cm) of accumulating snow, but in the winter of 2014–2015, the figure was 150.8 in (383 cm).
Fog is fairly common, particularly in spring and early summer, and the occasional tropical storm or hurricane can threaten the region, especially in late summer and early autumn. The last such storm to impact the city was Hurricane Sandy in October 2012. Due to its situation along the North Atlantic, the city is often subjected to sea breezes, especially in the late spring, when water temperatures are still quite cold and temperatures at the coast can be more than 20 °F (11 °C) colder than locations a few miles inland, sometimes dropping by that amount near midday.
Thunderstorms occur from May to September and are occasionally severe, with large hail, damaging winds and heavy downpours. Although Braintree has never been struck by a violent tornado, the city has experienced many tornado warnings. Damaging storms are more common in areas north, west, and northwest of the city.
As of the census of 2000, there were 33,828 people, 12,652 households, and 8,907 families residing in the town. The population density was 2,434.4 inhabitants per square mile (939.9/km2). There were 12,973 housing units at an average density of 933.6 per square mile (360.5/km2). The racial makeup of the town was 93.96% White, 1.18% Black or African American, 0.11% Native American, 3.14% Asian, 0.03% Pacific Islander, 0.64% from other races, and 0.95% from two or more races. Hispanic or Latino people of any race were 1.16% of the population.
More than 46% of town residents had Irish ancestry. As of 2014, Braintree had the second highest concentration of Irish Americans in the entire country, slightly behind Scituate, Massachusetts.
There were 12,652 households, out of which 29.6% had children under the age of 18 living with them, 55.4% were married couples living together, 11.7% had a female householder with no husband present, and 29.6% were non-families. 24.4% of all households were made up of individuals, and 11.9% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.16.
In the town the population was spread out, with 22.5% under the age of 18, 6.5% from 18 to 24, 28.9% from 25 to 44, 24.0% from 45 to 64, and 18.1% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 89.1 males. For every 100 females age 18 and over, there were 84.4 males.