The town green
Location in Tolland County, Connecticut
UNION CONNECTICUT Latitude and Longitude:
|• Type||Selectman-town meeting|
|• First selectman||David D. Eaton (R)|
|• Selectman||Mary Huda (R)|
|• Selectman||David Heck (D)|
|• Total||29.8 sq mi (77.2 km2)|
|• Land||28.7 sq mi (74.3 km2)|
|• Water||1.1 sq mi (2.9 km2)|
|Elevation||981 ft (299 m)|
|• Density||28.7/sq mi (11.5/km2)|
|Time zone||UTC−5 ( Eastern)|
|• Summer ( DST)||UTC−4 ( Eastern)|
06076 (Stafford Springs) and 06242 (Eastford)
|GNIS feature ID||0213519|
Union is a town located in the northeastern part of Tolland County, Connecticut, United States and is part of the Quinebaug and Shetucket Rivers Valley National Heritage Corridor. The population was 854 at the 2010 census, making it the least populous town and municipality in Connecticut. Union includes the village of Mashapaug located in the Eastern Uplands at the Massachusetts state line. Also, Union is located 33 miles (53 kilometers) northeast of the state capital, Hartford and 67 mi (108 km) southwest of Boston as well as 153 mi (246 km) northeast of New York City.
The first European Settlement in Union was in 1727, making Union the last Connecticut town east of the Connecticut River to be settled. The first settler was James McNall of Ireland.  He was closely followed by his brother William.  The town was incorporated in October 1734.  The name Union designates "union of lands". 
There were 500 people in the town in 1756. The population grew to 767 by 1800, but declined thereafter. There were just 431 people in Union in 1890. 
According to the United States Census Bureau, the town has a total area of 29.8 square miles (77 km2), of which 28.7 square miles (74 km2) is land and 1.1 square miles (2.8 km2) (3.75%) is water.
Union has the highest town center in eastern Connecticut at 1,015' and the 4th highest in the state.  The highest elevation in eastern Connecticut is 1,315' Burley Hill in the northwest part of town.  In addition, I-84 reaches its highest elevation in Connecticut (1,002') in Union.
Approximately one-third of the town is state park land, including Bigelow Hollow State Park, Nipmuck State Forest and the Mountain Laurel Sanctuary. A portion of the Yale-Myers Forest and Hull Foresters  are located in Union. All combined, there are nearly 34,000 acres of forestland in Union. 
Mashapaug Lake is a large lake in Union. The lake is used for fishing, boating, and swimming.
|U.S. Decennial Census |
At the census  of 2000, there were 693 people, 285 households, and 200 families residing in the town. The population density was 24.1 people per square mile (9.3/km²). There were 332 housing units at an average density of 11.6 per square mile (4.5/km²). The racial makeup of the town was 98.56% White, 0.14% Asian, and 1.30% from two or more races.
There were 285 households out of which 27.4% had children under the age of 18 living with them, 64.6% were married couples living together, 4.6% had a female householder with no husband present, and 29.5% were non-families. 22.5% of all households were made up of individuals and 4.9% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.87.
In the town, the population was spread out with 21.5% under the age of 18, 3.3% from 18 to 24, 34.6% from 25 to 44, 28.7% from 45 to 64, and 11.8% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 103.2 males. For every 100 females age 18 and over, there were 103.0 males.
The median income for a household in the town was $58,214, and the median income for a family was $65,417. Males had a median income of $48,021 versus $35,469 for females. The per capita income for the town was $27,900. About 2.0% of families and 3.5% of the population were below the poverty line, including 5.9% of those under age 18 and none of those age 65 or over.
High Schoolers have the option of attending Stafford High School, Rockville Vocational-Agricultural School, Windham Regional Technical Vocational School or Woodstock Academy.
With over 40,000 acres of forestland in and around town and a major interstate going through it, Union is known for outdoor recreation such as hunting, fishing, hiking, camping and picnicking.  The area's elevation and dominance of evergreen trees makes the area cooler than surrounding places.  Most activity is centered on Bigelow Hollow State Park, and especially at Mashapaug Lake.
Camp Pomperaug, a Boy Scout camp operated by the Connecticut Yankee Council, BSA, is situated within Union, and borders the state forest. It was originally property of the Wells family, for whom Wells Pond is named. The camp was originally situated on Lake Zoar in Monroe, but was relocated to the Union property when the original camp's dining hall was destroyed by a severe winter storm.
The camp includes old stone foundations of the buildings once comprising Well's Mill, and also includes a small Revolutionary War cemetery where, among other soldiers interred, lies a brother-in-law of Benedict Arnold. The burial site is thought by some to be haunted.
The Union Free Public Library is housed in one of the town's few public buildings. The library was established by a town meeting in November 1894, and opened March 25, 1895 in a private home. In 1912 it moved into a newly built building, which it still occupies. 
- Alonzo Horton, considered the second founder of the city of San Diego, California, and the founder of Hortonville, Wisconsin, was born in Union on October 24, 1813. His family moved away from the area in 1815. 
- Moses G. Leonard (1809–1899), a United States Representative from New York, grew up in Union but was born in nearby Stafford. 
- Ebenezer Stoddard (1785–1847), a United States Representative from Connecticut and Lieutenant Governor of Connecticut, was born in Union. 
- Rivero, Nicolas (25 August 2017). "The Smallest Town in Each of the 50 States". Mental Floss. Retrieved 25 June 2018.
- Charles Hammond and Harvey Merrill Lawson (1893) The History of Union, Conn, Price, Lee, & Adkins Co., New Haven, Connecticut. Pages 36 and 43.
- Charles Hammond and Harvey Merrill Lawson (1893) The History of Union, Conn, Price, Lee, & Adkins Co., New Haven, Connecticut. Pages 48-50.
- The Connecticut Magazine: An Illustrated Monthly. Connecticut Magazine Company. 1903. p. 335.
- Charles Hammond and Harvey Merrill Lawson (1893) The History of Union, Conn, Price, Lee, & Adkins Co., New Haven, Connecticut. Page 506.
- "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Archived from the original on May 23, 2015. Retrieved June 4, 2015.
- "Census of Population and Housing". Census.gov. Retrieved June 4, 2015.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- Union Free Public Library website, accessed June 25, 2009
- Charles Hammond and Harvey Merrill Lawson (1893) The History of Union, Conn, Price, Lee, & Adkins Co., New Haven, Connecticut. Pages 368-369.
- Charles Hammond and Harvey Merrill Lawson (1893) The History of Union, Conn, Price, Lee, & Adkins Co., New Haven, Connecticut. Pages 469-470.