Isaac I. Voorheis, also Voorhees or Voorhies, (December 22, 1799 – August 2, 1886) was an American politician who served two terms in the Michigan House of Representatives.
His father fought in the Revolutionary War as a member of the New Jersey state militia.
[4] In May 1824, he moved to Waterford, Michigan, and engaged in farming,[2] and within a few years became active in politics in the county.
He was a Democrat, and was a supervisor in Pontiac in 1833 and 1834 and a delegate to the state's first constitutional convention in 1835.
[5] Voorheis sold his farm and moved into nearby Pontiac during the Civil War, then moved to Lapeer, Michigan, in 1866, and died there on August 2, 1886.