2010 Adjusted Census Urban Area/Boundary (ACUA/ACUB): 2010 Adjusted Census Urban Area polygons extracted from version 17 of the Michigan Geographic Framework. Areas include Ann Arbor, MI; Chelsea, MI; Detroit, MI (part); Flint, MI (part); Goodrich, MI (part); Holly, MI; Milan, MI; Monroe, MI; Port Huron, MI (part); Richmond, MI; South Lyon--Howell, MI; and Toledo, OH--MI (part). The ACUB is the official urban/rural dividing line for transportation purposes.