Oak Creek vs. Shorewood   Year Founded: 1955 Population: 35,223 Scouting report: Oak Creek's motto is "Where city meets country," and its eastern border is along Lake Michigan's shore. It's one of the state's fastest-growing communities, and enjoys a mix of residential and commercial development.   Year Founded: 1917 Population: 13,763 Scouting report: The compact village is investing in its future with new buildings and businesses along its main street, Oakland Avenue. With mansions dotting swanky Lake Drive and smaller homes found throughout the rest of the village, there is housing for everyone - including apartments and condominiums. Close to the University of Wisconsin-Milwaukee, the suburb is a magnet for professional families.