Alexander Thomson was born in Franklin County, Pennsylvania. He apprenticed as a sickle maker. He moved to Bedford, Pennsylvania, studied law, was admitted to the bar in 1816 and commenced practice in Chambersburg, Pennsylvania. He held several local offices and was a member of the Pennsylvania House of Representatives.
Thomson was elected to the Eighteenth Congress to fill the vacancy caused by the resignation of John Tod. He was reelected to the Nineteenth Congress and served until May 1, 1826, when he resigned. He served as mayor of Lancaster, Pennsylvania, and was president judge of the sixteenth judicial district of Pennsylvania from 1827 to 1841. He was professor in the law school of Marshall College in Lancaster. He died in Chambersburg in 1848. Interment in Falling Spring Presbyterian Cemetery.
- United States Congress. "Alexander Thomson (id: T000227)". Biographical Directory of the United States Congress.
- The Political Graveyard
|U.S. House of Representatives|
| Member of the U.S. House of Representatives
from Pennsylvania's 13th congressional district
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