Estimated Population by County: 2010-2012

Tables

Estimated Population for Michigan Counties: 2000 and 2010-2012 (Excel Table)

Estimated Population for Metropolitan, Micropolitan, and Combined Statistical Areas: Michigan, 2010-2012 (Excel Table)

Components of Population Change for Michigan Counties: 2010-2012 (Excel Table)

Link to data for all states:
Population Estimates Page of the U.S. Census Bureau 

Maps

Population Change in Michigan Counties: 2010-2011 (pdf)

Population  Change in Michigan Counties: 2011-2012 (pdf)

Population Change in Michigan Counties: April 2010-July 2012 (pdf)

Natural Increase in Michigan Counties (Births minus Deaths): April 2010-2012 (pdf)

Net Migration for Michigan Counties: April 2010-2012 (pdf)