Hutchinson is a village located in Westmoreland County, Pennsylvania, United States, and is part of Sewickley Township. As of the 2000 census, Hutchinson had 99 single family homes, and a total population of 322. Although only about the size of a small subdivision, Hutchinson has its own post office and zip code: 15640. Hutchinson was built as a coal …Hutchinson is a village located in Westmoreland County, Pennsylvania, United States, and is part of Sewickley Township. As of the 2000 census, Hutchinson had 99 single family homes, and a total population of 322. Although only about the size of a small subdivision, Hutchinson has its own post office and zip code: 15640. Hutchinson was built as a coal mining town in 1924, and is geographically located above the Hutchinson Mine.