The Mt. Clemens Public Library website has a list of Macomb County Extinct Towns, Railroad Stops, & Place Name Changes. See it at: www.libcoop.net/mountclemens/placename.htm >From this list is this on Baseline: Base Line -  Post office in area bordered on the south by 8 Mile Road; annexed by Warren when it became a city in 1957. Hope this helps. Lisa Eschenburg