Population by Age in St. Charles County
*Base on 2010 Data
| Total population | 360,485 | 100.00% |
| Under 5 years | 24,297 | 6.74% |
| 5 to 9 years | 26,202 | 7.27% |
| 10 to 14 years | 26,625 | 7.39% |
| 15 to 19 years | 25,276 | 7.01% |
| 20 to 24 years | 21,443 | 5.95% |
| 25 to 29 years | 23,579 | 6.54% |
| 30 to 34 years | 23,906 | 6.63% |
| 35 to 39 years | 24,764 | 6.87% |
| 40 to 44 years | 25,879 | 7.18% |
| 45 to 49 years | 29,446 | 8.17% |
| 50 to 54 years | 27,805 | 7.71% |
| 55 to 59 years | 22,490 | 6.24% |
| 60 to 64 years | 18,395 | 5.10% |
| 65 to 69 years | 13,366 | 3.71% |
| 70 to 74 years | 9,567 | 2.65% |
| 75 to 79 years | 7,339 | 2.04% |
| 80 to 84 years | 5,460 | 1.51% |
| 85 years and over | 4,646 | 1.29% |
Male Population in St. Charles County
*Base on 2010 Data
| Male population | 176,922 | 49.08% |
| Under 5 years | 12,401 | 3.44% |
| 5 to 9 years | 13,254 | 3.68% |
| 10 to 14 years | 13,565 | 3.76% |
| 15 to 19 years | 13,012 | 3.61% |
| 20 to 24 years | 10,967 | 3.04% |
| 25 to 29 years | 11,685 | 3.24% |
| 30 to 34 years | 11,793 | 3.27% |
| 35 to 39 years | 12,213 | 3.39% |
| 40 to 44 years | 12,726 | 3.53% |
| 45 to 49 years | 14,392 | 3.99% |
| 50 to 54 years | 13,780 | 3.82% |
| 55 to 59 years | 10,778 | 2.99% |
| 60 to 64 years | 8,776 | 2.43% |
| 65 to 69 years | 6,388 | 1.77% |
| 70 to 74 years | 4,406 | 1.22% |
| 75 to 79 years | 3,220 | 0.89% |
| 80 to 84 years | 2,138 | 0.59% |
| 85 years and over | 1,428 | 0.40% |
Female Population in St. Charles County
*Base on 2010 Data
| Female population | 183,563 | 50.92% |
| Under 5 years | 11,896 | 3.30% |
| 5 to 9 years | 12,948 | 3.59% |
| 10 to 14 years | 13,060 | 3.62% |
| 15 to 19 years | 12,264 | 3.40% |
| 20 to 24 years | 10,476 | 2.91% |
| 25 to 29 years | 11,894 | 3.30% |
| 30 to 34 years | 12,113 | 3.36% |
| 35 to 39 years | 12,551 | 3.48% |
| 40 to 44 years | 13,153 | 3.65% |
| 45 to 49 years | 15,054 | 4.18% |
| 50 to 54 years | 14,025 | 3.89% |
| 55 to 59 years | 11,712 | 3.25% |
| 60 to 64 years | 9,619 | 2.67% |
| 65 to 69 years | 6,978 | 1.94% |
| 70 to 74 years | 5,161 | 1.43% |
| 75 to 79 years | 4,119 | 1.14% |
| 80 to 84 years | 3,322 | 0.92% |
| 85 years and over | 3,218 | 0.89% |
Median Age in St. Charles County
*Base on 2010 Data
| Both | 36.90% | |
| Male | 35.70% | |
| Female | 38.00% |
Race in St. Charles County
*Base on 2010 Data
| Total | 360,485 | 100.00% |
| Population of one race | 354,175 | 98.25% |
| White | 327,018 | 90.72% |
| Black or African American | 14,960 | 4.15% |
| American Indian and Alaska Native | 851 | 0.24% |
| Asian | 7,850 | 2.18% |
| Asian Indian | 3,131 | 0.87% |
| Chinese | 1,386 | 0.38% |
| Filipino | 830 | 0.23% |
| Japanese | 218 | 0.06% |
| Korean | 726 | 0.20% |
| Vietnamese | 807 | 0.22% |
| Other Asian | 752 | 0.21% |
| Native Hawaiian and Other Pacific Islander | 173 | 0.05% |
| Native Hawaiian | 38 | 0.01% |
| Guamanian or Chamorro | 49 | 0.01% |
| Samoan | 20 | 0.01% |
| Other Pacific Islander | 66 | 0.02% |
| Some Other Race | 3,323 | 0.92% |
| Population of Two or More Races | 6,310 | 1.75% |
| White; American Indian and Alaska Native | 1,259 | 0.35% |
| White; Asian | 1,394 | 0.39% |
| White; Black or African American | 2,269 | 0.63% |
| White; Some Other Race | 451 | 0.13% |
The Population 16 Years in St. Charles County
*Base on 2010 Data
| Total | 278,162 | 100.00% |
| Male | 135,012 | 48.54% |
| Female | 143,150 | 51.46% |
The Population 18 Years in St. Charles County
*Base on 2010 Data
| Total | 267,625 | 100.00% |
| Male | 129,620 | 48.43% |
| Female | 138,005 | 51.57% |
The Population 21 Years in St. Charles County
*Base on 2010 Data
| Total | 253,728 | 100.00% |
| Male | 122,399 | 48.24% |
| Female | 131,329 | 51.76% |
The Population 62 Years in St. Charles County
*Base on 2010 Data
| Total | 51,051 | 100.00% |
| Male | 22,676 | 44.42% |
| Female | 28,375 | 55.58% |
The Population 65 Years in St. Charles County
*Base on 2010 Data
| Total | 40,378 | 100.00% |
| Male | 17,580 | 43.54% |
| Female | 22,798 | 56.46% |
Race (total races tallied) in St. Charles County
*Base on 2010 Data
| White alone or in combination with one or more other races | 332,813 | 90.64% |
| Black or African American alone or in combination with one or more other races | 17,766 | 4.84% |
| American Indian and Alaska Native alone or in combination with one or more other races | 2,510 | 0.68% |
| Asian alone or in combination with one or more other races | 9,641 | 2.63% |
| Native Hawaiian and Other Pacific Islander alone or in combination with one or more other races | 377 | 0.10% |
| Some Other Race alone or in combination with one or more other races | 4,075 | 1.11% |
Hispanic or Latino by Specific Origin in St. Charles County
*Base on 2010 Data
| Total | 360,485 | 100.00% |
| Hispanic or Latino (of any race) | 9,983 | 2.77% |
| Mexican | 6,366 | 1.77% |
| Puerto Rican | 841 | 0.23% |
| Cuban | 250 | 0.07% |
| Other Hispanic or Latino | 2,526 | 0.70% |
| Not Hispanic or Latino | 350,502 | 97.23% |
Hispanic or Latino and Race in St. Charles County
*Base on 2010 Data
| Total | 360,485 | 100.00% |
| Hispanic or Latino | 9,983 | 2.77% |
| White alone | 5,940 | 1.65% |
| Black or African American alone | 133 | 0.04% |
| American Indian and Alaska Native alone | 159 | 0.04% |
| Asian alone | 61 | 0.02% |
| Native Hawaiian and Other Pacific Islander alone | 20 | 0.01% |
| Some Other Race alone | 2,896 | 0.80% |
| Two or More Races | 774 | 0.21% |
| Not Hispanic or Latino | 350,502 | 97.23% |
| White alone | 321,078 | 89.07% |
| Black or African American alone | 14,827 | 4.11% |
| American Indian and Alaska Native alone | 692 | 0.19% |
| Asian alone | 7,789 | 2.16% |
| Native Hawaiian and Other Pacific Islander alone | 153 | 0.04% |
| Some Other Race alone | 427 | 0.12% |
| Two or More Races | 5,536 | 1.54% |
Relationship in St. Charles County
*Base on 2010 Data
| Total | 360,485 | 100.00% |
| In households | 355,059 | 98.49% |
| Householder | 134,274 | 37.25% |
| Spouse | 78,804 | 21.86% |
| Child | 113,448 | 31.47% |
| Own child under 18 years | 85,904 | 23.83% |
| Other relatives | 13,449 | 3.73% |
| Under 18 years | 5,411 | 1.50% |
| 65 years and over | 2,413 | 0.67% |
| Nonrelatives | 15,084 | 4.18% |
| Under 18 years | 1,385 | 0.38% |
| 65 years and over | 496 | 0.14% |
| Unmarried partner | 7,805 | 2.17% |
| In group quarters | 5,426 | 1.51% |
| Institutionalized population | 1,621 | 0.45% |
| Male | 629 | 0.17% |
| Female | 992 | 0.28% |
| Noninstitutionalized population | 3,805 | 1.06% |
| Male | 1,982 | 0.55% |
| Female | 1,823 | 0.51% |
Households by Type in St. Charles County
*Base on 2010 Data
| Subject | Number | Percent |
|---|---|---|
| Total | 134,274 | 100.00% |
| Family households (families) | 97,621 | 72.70% |
| With own children under 18 years | 46,371 | 34.53% |
| Husband-wife family | 78,804 | 58.69% |
| With own children under 18 years | 35,782 | 26.65% |
| Male householder, no wife present | 5,639 | 4.20% |
| With own children under 18 years | 3,069 | 2.29% |
| Female householder, no husband present | 13,178 | 9.81% |
| With own children under 18 years | 7,520 | 5.60% |
| Nonfamily households | 36,653 | 27.30% |
| Householder living alone | 29,568 | 22.02% |
| Male | 12,679 | 9.44% |
| 65 years and over | 2,418 | 1.80% |
| Female | 16,889 | 12.58% |
| 65 years and over | 7,575 | 5.64% |
Households with individuals under 18 years in St. Charles County
*Base on 2010 Data
| Total | 49,980 | 37.22% |
Households with individuals under 65 years in St. Charles County
*Base on 2010 Data
| Total | 28,470 | 21.20% |
Average Household Size in St. Charles County
*Base on 2010 Data
| Average household size | 3 | % |
Average Family Size in St. Charles County
*Base on 2010 Data
| Average family size | 3 | % |
Housing Occupancy(Total housing units) in St. Charles County
*Base on 2010 Data
| Total | 141,016 | 100.00% |
| Occupied housing units | 134,274 | 95.22% |
| Vacant housing units | 6,742 | 4.78% |
| For rent | 2,113 | 1.50% |
| Rented, not occupied | 112 | 0.08% |
| For sale only | 2,182 | 1.55% |
| Sold, not occupied | 355 | 0.25% |
| For seasonal, recreational, or occasional use | 632 | 0.45% |
| All other vacants | 1,348 | 0.96% |
Homeowner Vacancy Rate in St. Charles County
*Base on 2010 Data
| Homeowner vacancy rate (percent) | 2.00% |
Rental Vacancy Rate in St. Charles County
*Base on 2010 Data
| Rental vacancy rate (percent) | 7.50% |
Housing Tenure(Occupied housing units) in St. Charles County
*Base on 2010 Data
| Total | 134,274 | 100.00% |
| Owner-occupied housing units | 108,219 | 80.60% |
| Renter-occupied housing units | 26,055 | 19.40% |
Population in Occupied Housing Units by Tenure(Population in occupied housing units) in St. Charles County
*Base on 2010 Data
| Owner-occupied housing units | 296,678 | 83.56% |
| Renter-occupied housing units | 58,381 | 16.44% |
Average Household Size of Occupied Housing Units by Tenure in St. Charles County
*Base on 2010 Data
| Owner occupied | 3 | % |
| Renter occupied | 2 | % |