Settled in 1862 by Conrad Miller, Union was incorporated in 1878 and served as an active trade route between The Dalles and Umatilla and the mines in Baker City. Later timber logging and lumber mills were added. Union is now the second largest city in Union County and was once the county seat, and is known for its elegant Victorian homes and brick buildings that grace the tree lined city streets. Main Street is a National Historic District, and some Modern additions to complement the National Historic District include a state-of-the-art primary care Health Center, a tournament-ready athletic complex, and Buffalo Peak Golf Course.