Last official estimated population of Bay City city Bay County Michigan state was 34149 year 2014 1. Population estimates base April 1 2010 V2019 34929. Bay County Michigan 1911 Map Rand Mcnally Bay City Pinconning Auburn Kawkawlin Essexville Fisherville Munger Bentl Bay County Pinconning County Map Full demographic report of Bay City MI population including education levels household income job market ethnic makeup and languages. Population of bay city mi . Based on 2010 census data Bay Midland and Saginaw Counties have a combined population of 391569 people. The 2010 Population was 107679 and has seen a growth of -530 since this time. This was 0011 of total US population and 034 of total Michigan state population. What was the peak population of Bay City. 54 on the list of Top 101 cities with the most people born in the same US. In fact after researching dangerous places to live NeighborhoodScout found Bay City to be one of the top 100 most dangerous cities in the USA. ...