The 42nd parallel north forms most of the New York-Pennsylvania border, although due to imperfect surveying in 1785-1786, this boundary wanders around on both sides of the true parallel. The area around the parallel in this region is known as the Twin Tiers.
California, Nevada, and Utah have the parallel 42° north as their northern border, and the adjoining U.S. states of Oregon and Idaho have the parallel 42° north as their southern border.
The parallel passes through (or near - within one-half degree of latitude) the following cities in the United States: Medford, Oregon, Yreka, California, Des Moines, Iowa, Chicago, Illinois, Detroit, Michigan, Cleveland, Ohio, Erie, Pennsylvania, Binghamton, New York, Hartford, Connecticut, Providence, Rhode Island, and Boston, Massachusetts (and outside the U.S. - Rome, Italy).
