Clay County, South Dakota Facts
| Facts | |
| State | South Dakota |
| Land area | 412.2 square miles |
| Population Density | 33.6 persons per square mile. |
| Population | |
| Population (2013) | 13,935 |
| Population change | 0.5% | Under 5 years of age | 5.6% |
| Under 18 | 17.8% |
| 65 and over | 10.6% |
| Females | 50.8% |
| White | 90.8 |
| Hispanic or Latino of any race | 2.6 |
| Asian | 2.1% |
| Two or more races | 2.2% |
| Black or African American | 1.6% |
| Native American | 3.2% |
| Pacific Islander | 0.1% |
| Had graduated from high school | 95% |
| Had a bachelor’s degree or higher | 41.6% |
| Veterans | 943 |
| Households and Housing | |
| Households | 5,145 |
| Persons per household | 2.3 |
| Living in the same house for one year or more | 65% |
| Median household income | $38,173 |
| The per capita income | $20,595 |
| Live below the poverty line. | 24.5% |
| housing units | 5,738 |
| Multi-unit structures | 33% |
| The median value of owner-occupied housing | $133,800 |
| Residents owning their homes. | 55.8% |
| Business Facts | |
| Total number of firms | 811 |
| Women-owned firms | 0% |
| Asian-owned firms | 0% |
| Hispanic-owned firms | 0% |
| Black-owned firms | 0% |
| Native American-owned firms | 0% |
| Pacific Islander-owned firms | 0% |
| Retail sales | $140,095 |
| Retail sales per capita | $10,410 |
| Manufacturers shipments | $0 |
| Merchant wholesaler sales | $0 |