Horace S. Cooley (1806 – April 2, 1850) was an American politician.
Born in Hartford, Connecticut, Cooley studied medicine and then law. In 1840, Cooley moved to Rushville, Illinois and then finally settled in Quincy, Illinois. In 1842, Cooley was appointed quartermaster general of Illinois. In 1846, Cooley was appointed to and then elected Illinois Secretary of State. Cooley was a Democrat. He died in 1850 while still in office.  
- 'Historical Encyclopedia of Illinois,' vol. 1, Henry L. Fowkes, Munsell Publishing Company: 1918, Biographical Sketch of Horace S. Cooley, pg. 121
- 'Collections of the Illinois State Historical Library,' volume VII, 1911, pg. 195
Secretary of State of Illinois
David L. Gregg
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