|— Town —|
|• Type||Selectman-town meeting|
|• First selectman||Larry Groh, Jr.|
|• Total||48.7 sq mi (126.1 km2)|
|• Land||46.9 sq mi (121.6 km2)|
|• Water||1.7 sq mi (4.4 km2)|
|Elevation||469 ft (143 m)|
|• Density||190/sq mi ( 75/km2)|
|Time zone||Eastern (UTC-5)|
|• Summer (DST)||Eastern (UTC-4)|
|ZIP code||06255, 06262, 06277|
|GNIS feature ID||0213516|
Thompson is a rural town in Windham County, Connecticut, United States. The town was named after Sir Robert Thompson, an English landholder. The population was 9,458 at the 2010 census. Thompson is located in the northeastern corner of the state and is bordered on the north by Webster, Massachusetts, on the east by Douglas, Massachusetts and Burrillville, Rhode Island, on the west by Woodstock, Connecticut, and on the south by Putnam, Connecticut.
Thompson has the highest-banked race track (Thompson International Speedway, a 5/8 mile oval) in New England. This speedway holds one of the biggest race programs in New England, The World Series of Auto Racing, where 14 divisions and about 600 cars show up each fall. Another claim to fame is that the Tri-State Marker is located just on the border of Thompson. The term "Swamp Yankee" is thought to have originated in Thompson during the American Revolution in 1776.
According to the United States Census Bureau, the town has a total area of 48.7 square miles (126 km2), of which 46.9 square miles (121 km2) is land and 1.7 square miles (4.4 km2), or 3.51%, is water. Thompson possesses many small ponds, such as Little Pond and Long Pond, as well as two principal lakes: West Thompson Lake and Quaddick Lake. Contained within its borders are several moderately sized rivers, the largest of which is the French River, a tributary of the Quinebaug River, which also runs through Thompson. The highest point in Thompson and the surrounding villages is Fort Hill at 649 feet (198 m) above sea level.
 Adjacent towns
- Burrillville, Rhode Island
- Douglas, Massachusetts
- Dudley, Massachusetts
- Webster, Massachusetts
- Putnam, Connecticut
- Woodstock, Connecticut
Thompson is composed of ten villages:
- East Thompson
- North Grosvenordale, (including the North Grosvenordale Mill Historic District).
- Thompson Hill (including the Thompson Hill Historic District).
- West Thompson
As of the census of 2000, there were 8,878 people, 3,482 households, and 2,472 families residing in the town. The population density was 189.1 people per square mile (73.0/km²). There were 3,710 housing units at an average density of 79.0 per square mile (30.5/km²). The racial makeup of the town was 98.02% White, 0.42% African American, 0.25% Native American, 0.35% Asian, 0.02% Pacific Islander, 0.24% from other races, and 0.71% from two or more races. Hispanic or Latino of any race were 0.75% of the population.
There were 3,482 households out of which 33.4% had children under the age of 18 living with them, 58.2% were married couples living together, 8.9% had a female householder with no husband present, and 29.0% were non-families. 23.6% of all households were made up of individuals and 10.0% had someone living alone who was 65 years of age or older. The average household size was 2.55 and the average family size was 3.02.
In the town the population was spread out with 25.0% under the age of 18, 6.5% from 18 to 24, 31.3% from 25 to 44, 23.9% from 45 to 64, and 13.3% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 99.9 males. For every 100 females age 18 and over, there were 95.7 males.
The median income for a household in the town was $46,065, and the median income for a family was $53,088. Males had a median income of $38,949 versus $26,504 for females. The per capita income for the town was $21,003. About 2.8% of families and 5.4% of the population were below the poverty line, including 5.7% of those under age 18 and 3.6% of those age 65 or over.
Thompson has a public school system in which the elementary, middle, and high school buildings are connected. The Mary R. Fisher Memorial Elementary School has students in pre-K through 4th grade, Thompson Middle School consists of grades 5-8, and Tourtellotte Memorial High School has students in grades 9-12. Also in town are several private schools, the Catholic St Joseph's School, currently serving pre-K - grade 8, and Marianapolis Preparatory, a Marian high school located on historic Thompson Hill.
The original Tourtellotte Memorial High School building, which exists today as administrative offices for the school system, was built in the Greek Revival style. The cornerstone was laid in 1907 and the school opened in 1909. The school is named in memory of Dr. Jacob F. Tourtellotte. Tourtellotte was a ship's surgeon in the U.S. Navy during the Civil War. The school also houses a small museum, called the "Memorial Room" which contains portraits of Tourtellotte and his family, and some of their possessions. It is maintained by the local historical society, and is usually open to the public for tours one Sunday per month.
Marianapolis Preparatory School was established in 1926, sponsored by the Congregation of Marians of the Immaculate Conception. The school is located on the former Ream Estate, built by Norman Bruce Ream, a Director of The Pullman Company, U.S. Steel, and The National Biscuit Company, which is now known as Nabisco. The Estate, including the circa 1900 mansion "Carolyn Hall," named after Ream's wife, was sold to the Marians in 1931, but the Mansion burned down in 1964 and a new main school building was built in its place.
The Thompson Public Library is located at 934 Riverside Drive, North Grosvenordale. It is combined with the town's Community Center, and contains 20,400 square feet (1,900 m2) holding 55,000 items, including books, magazines, CDs, DVDs, audio tapes, video tapes, and online resources.
The library was started in 1902 with 1,370 books in a small building on Thompson Hill, now known as the Ellen Larned Memorial Library. Two branches were created, the Quinebaug Branch, in operation from 1961 to 1994, and the Grosvenordale Branch, in operation from 1958 to 1966. Thompson was the first small town in Connecticut to have a bookmobile service, operating from 1966 to 1993. The current library in North Grosvenordale was finished in 1994.
 Notable people
- George Whitefield Davis (1839–1918), engineer and Major General in the United States Army, military governor of Puerto Rico and the first military governor of the Panama Canal Zone; born in Thompson
- James Hillman (1926–2011), post-jungian psychologist and founder of Archetypal psychology; died at his home in Thompson.
- Simon Larned (1753–1817), Revolutionary War captain, War of 1812 colonel and US Congressman for Massachusetts; born in Thompson
- Andrew Mamedoff (1912–1941), pilot who fought for the RAF and died during the Battle of Britain; born in Thompson
- James Brown Mason (1775–1819), two-term US Congressman for Rhode Island; born in Thompson
- Ossian Everett Mills (1846–1920), founder of the Phi Mu Alpha Sinfonia music fraternity; born in town and buried in a small family plot in Thompson
- James M. Munyon (1848–1918), publisher and doctor; born in Thompson
- General Stafford (1868–1923), baseball player; born in Thompson
- John E. Tourtellotte (1869–1939), architect; born in East Thompson
- Ithiel Town (1784–1844), architect and civil engineer; born in Thompson
- Anastasy Vonsyatsky (1898–1965), Russian anti-Bolshevik émigré and fascist leader of the All Russian National Revolutionary Party; lived in and is buried in Thompson
- Government - Town Officials
- "Profile for Thompson, Connecticut". ePodunk. Retrieved 2010-05-11.
- "Race, Hispanic or Latino, Age, and Housing Occupancy: 2010 Census Redistricting Data (Public Law 94-171) Summary File (QT-PL), Thompson town, Connecticut". U.S. Census Bureau, American FactFinder 2. Retrieved October 3, 2011.
- "USGS NE CT Survey". Retrieved 2011-06-16.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- Echoes of Old Thompson, Vol I