Sioux Falls, S.D. (AP) The mayor of South Dakota's largest city is getting a firsthand look at North Dakota's oil boomtown. Sioux Falls Mayor Mike Huether on Monday was traveling to Williston, the hub of western North Dakota's bustling oil patch. He was being accompanied by Mike Cooper, Sioux Falls' Director of Planning and Building Services. The Sioux Falls officials planned to meet with Williston Mayor Howard Klug and a city commissioner, and tour the city and an oil rig site. Williston is the nation's fastest-growing micropolitan area, an entity with between 10,000 and 50,000 people. Huether planned a Wednesday morning news conference in Sioux Falls to discuss the trip.