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 mi² (=2166.5 km²), in this year population density was 194.47 p/mi². If population growth rate would be same as in period 2010-2014 (-0.06%/yr), St. Clair County population in 2026 would be 161,577 [0].
Historical population of St. Clair County for period 1830-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1830-1840] +15.25 %/yr
[1840-1850] +8.51 %/yr
[1850-1860] +9.83 %/yr
[1860-1870] +3.26 %/yr
[1870-1880] +2.34 %/yr
[1880-1890] +1.21 %/yr
[1890-1900] +0.58 %/yr
[1900-1910] -0.54 %/yr
[1910-1920] +1.03 %/yr
[1920-1930] +1.54 %/yr
[1930-1940] +1.21 %/yr
[1940-1950] +1.85 %/yr
[1950-1960] +1.59 %/yr
[1960-1970] +1.15 %/yr
[1970-1980] +1.45 %/yr
[1980-1990] +0.48 %/yr
[1990-2000] +1.21 %/yr
[2000-2005] +0.48 %/yr
[2005-2010] -0.62 %/yr
[2010-2014] -0.06 %/yr
Looking for settlements in St. Clair County? Visit this page: Settlements in St. Clair County, MI
Population of St. Clair County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4290 | 3908 | 8,198 |
| 5 to 9 | 4931 | 4608 | 9,539 |
| 10 to 14 | 5472 | 5154 | 10,626 |
| 15 to 19 | 5438 | 5011 | 10,449 |
| 20 to 24 | 4966 | 4683 | 9,649 |
| 25 to 29 | 4176 | 4099 | 8,275 |
| 30 to 34 | 4159 | 4206 | 8,365 |
| 35 to 39 | 4286 | 4390 | 8,676 |
| 40 to 44 | 5163 | 5299 | 10,462 |
| 45 to 49 | 5956 | 5907 | 11,863 |
| 50 to 54 | 6717 | 6676 | 13,393 |
| 55 to 59 | 6343 | 6503 | 12,846 |
| 60 to 64 | 5485 | 5569 | 11,054 |
| 65 to 69 | 4385 | 4543 | 8,928 |
| 70 to 74 | 3090 | 3474 | 6,564 |
| 75 to 79 | 2111 | 2493 | 4,604 |
| 80 to 84 | 1320 | 1771 | 3,091 |
| 85+ | 1207 | 2289 | 3,496 |
St. Clair County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 76960 | 78027 | 154,987 |
| WAC | 76395 | 77644 | 154,039 |
| WA | 74877 | 76104 | 150,981 |
| NHWAC | 74066 | 75293 | 149,359 |
| NHWA | 72701 | 73906 | 146,607 |
| BAC | 2973 | 2751 | 5,724 |
| NHBAC | 2811 | 2587 | 5,398 |
| H | 2535 | 2556 | 5,091 |
| HWAC | 2329 | 2351 | 4,680 |
| HWA | 2176 | 2198 | 4,374 |
| BA | 2178 | 1923 | 4,101 |
| NHBA | 2086 | 1833 | 3,919 |
| TOM | 1566 | 1594 | 3,160 |
| NHTOM | 1407 | 1435 | 2,842 |
| IAC | 1022 | 1055 | 2,077 |
| NHIAC | 852 | 877 | 1,729 |
| AAC | 686 | 742 | 1,428 |
| NHAAC | 655 | 715 | 1,370 |
| AA | 450 | 522 | 972 |
| NHAA | 435 | 506 | 941 |
| IA | 410 | 410 | 820 |
| NHIA | 321 | 323 | 644 |
| HIAC | 170 | 178 | 348 |
| HBAC | 162 | 164 | 326 |
| HTOM | 159 | 159 | 318 |
| HBA | 92 | 90 | 182 |
| HIA | 89 | 87 | 176 |
| NAC | 44 | 62 | 106 |
| NHNAC | 36 | 52 | 88 |
| HAAC | 31 | 27 | 58 |
| NA | 14 | 30 | 44 |
| NHNA | 10 | 24 | 34 |
| HAA | 15 | 16 | 31 |
| HNAC | 8 | 10 | 18 |
| HNA | 4 | 6 | 10 |
• Wayne County population
53.8 mi,
214°
• Oakland County
40.7 mi,
242°
• Macomb County
21.6 mi,
214°
• Genesee County
52.8 mi,
276°
• Livingston County
66.9 mi,
250°
• Lapeer County
30.2 mi,
291°
• Shiawassee County
74.7 mi,
271°
• Tuscola County
54.7 mi,
314°
• Sanilac County
36 mi,
2°
• Huron County
68.3 mi,
352°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Macomb, Oakland Michigan Notes
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