population st clair county michigan
Population of St. Clair County. Last official estimated population of St. Clair County was 162,673 (year 2014)[1]. This was 0.051% of total US population and 1.6% of total Michigan state population. Area of St. Clair County is 836.5 miÂ² (=2166.5 kmÂ²), in this year population density was 194.47 p/miÂ².