Hanson was first settled in 1632 as the western parish of Pembroke. The town was officially incorporated in 1820, and was named for Maryland publisher of the Federal Republican newspaper and U.S. Senator Alexander Contee Hanson. Hanson was a champion of free speech and freedom of the press, and he was severely beaten and his newspaper offices were attacked and destroyed by an angry mob after he published an article that was critical of the administration shortly after the outbreak of the War of 1812.

The town’s early industry revolved around farming, as well as bog iron and quarrying. Mills also popped up along the rivers during the nineteenth century. Today the town is mostly residential, with some farming and cranberry farming. Ocean Spray was first started by several bogs in Hanson, and remained headquartered in Hanson before moving to Plymouth in September 1977.

Hanson was home to the Cranberry Specialty Hospital, which opened in 1919 as the Plymouth County Hospital for Tuberculosis and closed in 1992.

According to the United States Census Bureau, the town has a total area of 15.7 square miles (40.6 km²), of which 15.0 square miles (38.9 km²) is land and 0.66 square miles (1.7 km²), or 4.21%, is water. It is the 250th largest town in the Commonwealth, over seven square miles smaller than the average. Hanson is considered one of the inland towns of Massachusetts’s South Shore, and is bordered by Rockland and Hanover to the north, Pembroke to the east, Halifax to the south, East Bridgewater to the west, and Whitman to the northwest. Hanson is located approximately 9 miles (14 km) east of Brockton, 13 miles (21 km) south of Quincy, and 18 miles (29 km) south-southeast of Boston.

Mostly flatland, the highest elevation in town is Bonney Hill at 152 ft, making it one of the highest points in Plymouth County. Another hill of prominence is Almshouse Hill near the current day center of town and named for the Josiah Cushing home (built in 1763), which was purchased in 1837 and used as an almshouse until 1902.

Hanson, like many towns in central Plymouth County, is dominated by lakes, rivers and swamps. The largest ponds include Oldham Pond along the Pembroke town line, Indian Head Pond (the source of Indian Head Brook) just south of Oldham Pond, Maquan Pond, located east of the center of the town, and Wampatuck Pond, located in the center of the town. In addition to Indian Head Brook, the town has several other brooks and rivers, including the Shumatuscacant River and Poor Meadow Brook to the west, and White Oak Brook to the south. To the north of town lies the Little Cedar Swamp, along Indian Head Brook. There is a small town forest and two camps, Rainbow Camp and Camp Kiwanee, within the town as well. Burrage Pond Wildlife Management Area lies mainly in the section of town called Burrage or South Hanson. About half of the 1,625 acres (7 km²) are in Hanson, the other half in Halifax.

As of the census of 2000, there were 9,495 people, 3,123 households, and 2,545 families residing in the town. The population density was 632.5 people per square mile (244.2/km²). There were 3,178 housing units at an average density of 211.7 per square mile (81.7/km²).

There were 3,123 households, out of which 40.3% had children under the age of 18 living with them, 69.6% were married couples living together, 8.7% had a female householder with no husband present, and 18.5% were non-families. 14.8% of all households were made up of individuals, and 6.1% had someone living alone who was 65 years of age or older. The average household size was 3.03 and the average family size was 3.38.

In the town, the population was spread out, with 28.2% under the age of 18, 6.9% from 18 to 24, 31.1% from 25 to 44, 25.1% from 45 to 64, and 8.6% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 97.2 males. For every 100 females age 18 and over, there were 93.7 males.

The median income for a household in the town was $62,687, and the median income for a family was $68,560. Males had a median income of $46,508 versus $31,337 for females. The per capita income for the town was $23,727. About 2.8% of families and 3.8% of the population were below the poverty line, including 2.3% of those under age 18 and 11.6% of those age 65 or over.

Statistically, Hanson is the 180th most populous and the 154th most densely populated town in Massachusetts. It is just below the median in terms of population, and below the average but above the median in terms of density.

On the national level, Hanson is a community of the Ninth congressional district, currently represented by Bill Keating. The state’s senior (Class I) member of the United States Senate is Elizabeth Warren. The junior (Class II) senator is Ed Markey.

On the state level, Hanson is represented in the Massachusetts House of Representatives as a part of the Sixth Plymouth district, which includes the towns of Duxbury, Pembroke and portions of Halifax. The town is represented in the Massachusetts Senate as a part of the Second Plymouth and Bristol district, which includes Brockton, Halifax, Hanover, Whitman and portions of East Bridgewater and Easton. The town is patrolled by the First (Norwell) Barracks of Troop D of the Massachusetts State Police.

Hanson is governed by the open town meeting form of government and is led by current Town Administrator John Stanbrook and a five-member Board of Selectmen. The town hall is located on the shore of Wampatuck Pond, at the town center. In the same area are the Fire Department headquarters and the Hanson Public Library, which is a member of the SAILS Library Network. The Hanson Police Department headquarters, built in 2007, is located on Main Street (Rte. 27). There is a branch firehouse along Route 27 near the train station, and the town’s post office is located near the intersection of Routes 27 and 58. Town meetings are held at the Hanson Middle School Auditorium.

There are no freeways in Hanson, which is equidistant between Routes 3 and 24. The main state routes through town are Route 14 and Route 58, which intersect and run coextensively for a short stretch in the middle of town. Route 27 also passes through the town, following a portion of the Whitman and East Bridgewater borders before crossing the southern section of town.

The town lies along the Kingston-Plymouth line of the MBTA’s commuter rail service, with a stop along Route 27. There is a small airport, Cranland Airport, which serves only small aircraft. The nearest national and international air service is at Logan International Airport in Boston.