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Stephenson became a colonel in the Illinois militia, and commanded a regiment in the War of 1812. In 1813 he was appointed adjutant general of Illinois. He served as the representative of the Illinois Territory in the United States Congress from 1814 to 1816. He was a representative to the convention that wrote the first constitution for the State of Illinois in 1818.
Stephenson died on October 10, 1822, and is buried in Edwardsville. Stephenson County, Illinois was named for him.
See also 
- Benjamin Stephenson House
- Benjamin Stephenson at the Biographical Directory of the United States Congress
|United States House of Representatives|
|Delegate to the U.S. House of Representatives
from Illinois Territory
November 14, 1814 – March 3, 1817
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