Brockway is a borough in Jefferson County, Pennsylvania, United States. The population was 2,072 at the 2010 census. The community was laid out as "Brockwayville" in 1836. The borough was named for Alonzo and John S. Brockway, who came to the site in 1822. A post office called "Brockwayville" was established in 1829, and the name of the post of…Brockway is a borough in Jefferson County, Pennsylvania, United States. The population was 2,072 at the 2010 census. The community was laid out as "Brockwayville" in 1836. The borough was named for Alonzo and John S. Brockway, who came to the site in 1822. A post office called "Brockwayville" was established in 1829, and the name of the post office was changed to "Brockway" in 1925.