Mackey was born in White Deer Township, Union County, Pennsylvania. In 1837, he graduated from Union College in Schenectady, New York, with Phi Beta Kappa honors and membership in The Kappa Alpha Society, before studying law at Dickinson College in Carlisle, Pennsylvania.
Mackey served as a delegate to the 1852 Whig National Convention and to the 1872 Democratic National Convention. He campaigned, unsuccessfully, for a seat in the 41st United States Congress in 1868 but was elected mayor of Lock Haven in 1870. From March 4, 1875 to March 3, 1879 he served as a Democratic U.S. Representative to the Forty-fourth and 45th United States Congresses, representing the 20th District of Pennsylvania.
He died in Lock Haven, Pennsylvania, February 8, 1889, and was interred at Highland Cemetery in Lock Haven.
- United States Congress. "Levi A. Mackey (id: M000025)". Biographical Directory of the United States Congress.
- The Political Graveyard
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Hiram L. Richmond
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