Last official estimated population of Sanilac County was 43,053 (year 2014)[1]. This was 0.014% of total US population and 0.4% of total Michigan state population. Area of Sanilac County is 1,589.9 mi² (=4117.9 km²), in this year population density was 27.08 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Sanilac County population in 2026 would be 42,871 [0].
Historical population of Sanilac County for period 1850-2014 [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

[1850-1860] +13.66 %/yr
[1860-1870] +6.72 %/yr
[1870-1880] +6.11 %/yr
[1880-1890] +2.15 %/yr
[1890-1900] +0.73 %/yr
[1900-1910] -0.33 %/yr
[1910-1920] -0.82 %/yr
[1920-1930] -1.18 %/yr
[1930-1940] +0.82 %/yr
[1940-1950] +0.24 %/yr
[1950-1960] +0.47 %/yr
[1960-1970] +0.77 %/yr
[1970-1980] +1.57 %/yr
[1980-1990] -0.21 %/yr
[1990-2000] +1.09 %/yr
[2000-2005] +0.15 %/yr
[2005-2010] -0.78 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Sanilac County? Visit this page: Settlements in Sanilac County, MI
Population of Sanilac County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1152 | 1065 | 2,217 |
| 5 to 9 | 1255 | 1245 | 2,500 |
| 10 to 14 | 1408 | 1384 | 2,792 |
| 15 to 19 | 1348 | 1329 | 2,677 |
| 20 to 24 | 1151 | 1065 | 2,216 |
| 25 to 29 | 1006 | 1002 | 2,008 |
| 30 to 34 | 1074 | 1015 | 2,089 |
| 35 to 39 | 1065 | 1061 | 2,126 |
| 40 to 44 | 1237 | 1184 | 2,421 |
| 45 to 49 | 1291 | 1403 | 2,694 |
| 50 to 54 | 1680 | 1580 | 3,260 |
| 55 to 59 | 1683 | 1674 | 3,357 |
| 60 to 64 | 1571 | 1546 | 3,117 |
| 65 to 69 | 1199 | 1291 | 2,490 |
| 70 to 74 | 977 | 1072 | 2,049 |
| 75 to 79 | 712 | 864 | 1,576 |
| 80 to 84 | 451 | 570 | 1,021 |
| 85+ | 367 | 610 | 977 |
Sanilac 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 |
| WAC | 20272 | 20668 | 40,940 |
| WA | 20059 | 20438 | 40,497 |
| NH | 19824 | 20226 | 40,050 |
| NHWAC | 19534 | 19993 | 39,527 |
| NHWA | 19338 | 19797 | 39,135 |
| H | 803 | 734 | 1,537 |
| HWAC | 738 | 675 | 1,413 |
| HWA | 721 | 641 | 1,362 |
| IAC | 239 | 239 | 478 |
| TOM | 221 | 234 | 455 |
| NHTOM | 202 | 199 | 401 |
| BAC | 224 | 158 | 382 |
| NHIAC | 195 | 181 | 376 |
| NHBAC | 207 | 136 | 343 |
| IA | 130 | 114 | 244 |
| AAC | 115 | 125 | 240 |
| BA | 136 | 80 | 216 |
| NHAAC | 91 | 111 | 202 |
| NHBA | 128 | 70 | 198 |
| NHIA | 94 | 78 | 172 |
| AA | 77 | 88 | 165 |
| NHAA | 58 | 76 | 134 |
| HIAC | 44 | 58 | 102 |
| HIA | 36 | 36 | 72 |
| HTOM | 19 | 35 | 54 |
| HBAC | 17 | 22 | 39 |
| HAAC | 24 | 14 | 38 |
| HAA | 19 | 12 | 31 |
| HBA | 8 | 10 | 18 |
| NAC | 6 | 9 | 15 |
| NHNAC | 6 | 9 | 15 |
| NA | 4 | 6 | 10 |
| NHNA | 4 | 6 | 10 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Oakland County population
66.1 mi,
214°
• Macomb County
55.4 mi,
194°
• Genesee County
61.2 mi,
241°
• St. Clair County
36 mi,
182°
• Bay County
69.1 mi,
284°
• Lapeer County
38.4 mi,
229°
• Tuscola County
39.9 mi,
273°
• Huron County
33.4 mi,
341°
• Iosco County
61.7 mi,
350°
• Arenac County
68.2 mi,
306°
[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
*St. Clair Michigan Notes
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