| | Orange City, IA | Sioux Center, IA | United States |
| Population | 6,214 | 8,090 | 329,725,481 |
| Female Population | 53.3% | 49.2% | 50.5% |
| Male Population | 46.7% | 50.8% | 49.5% |
| Median Age | 34.8 | 30.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 6,066 | 7,053 | 309,327,143 |
| Population - 2000 | 5,582 | 6,002 | 285,036,114 |
| Population - 1990 | 4,940 | 5,074 | 251,960,433 |
| Pop. 2000 to Now | 12.2% | 27.7% | 15.6% |
| Pop. 1990 to Now | 26.7% | 51.1% | 30.8% |
| space4 | | | |
| Population Density | 1,472.2 | 1,300.2 | 93.4 |
| Land Area | 4.2 | 6.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Orange City, IA | Sioux Center, IA | United States |
| Age 0 to 4 | 5.6% | 10.4% | 5.9% |
| Age 5 to 9 | 7.2% | 4.3% | 6.1% |
| Age 10 to 14 | 5.7% | 7.2% | 6.6% |
| Age 15 to 17 | 2.5% | 6.2% | 3.9% |
| Age 18 to 20 | 9.8% | 10.6% | 4.0% |
| Age 21 to 24 | 10.1% | 5.8% | 5.2% |
| Age 25 to 34 | 9.2% | 11.6% | 13.8% |
| Age 35 to 44 | 13.1% | 11.3% | 12.9% |
| Age 45 to 54 | 8.3% | 7.2% | 12.6% |
| Age 55 to 59 | 3.8% | 7.5% | 6.7% |
| Age 60 to 64 | 6.4% | 3.6% | 6.3% |
| Age 65 to 74 | 11.1% | 6.8% | 9.6% |
| Age 75 to 84 | 5.4% | 4.1% | 4.5% |
| Age 85 and over | 1.8% | 3.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Orange City, IA | Sioux Center, IA | United States |
| White | 92.9% | 85.9% | 59.4% |
| Black | 0.9% | 0.4% | 12.2% |
| Asian | 0.1% | 1.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.8% | 1.8% | 3.2% |
| Hispanic | 3.3% | 10.7% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Orange City, IA | Sioux Center, IA | United States |
| Married Population | 56.1% | 56.7% | 49.8% |
| Currently Married | 56.1% | 56.6% | 48.0% |
| Married but Separated | 0.0% | 0.1% | 1.8% |
| Single Population | 43.9% | 43.3% | 50.2% |
| Never Married | 34.9% | 32.6% | 33.8% |
| Divorced | 5.9% | 4.8% | 10.8% |
| Widowed | 3.1% | 5.9% | 5.6% |
| space5 | | | |
| Household Size | 2.54 | 2.63 | 2.60 |
| Households | 2,143 | 2,684 | 124,010,992 |
| Family Households | 1,422 | 1,851 | 80,755,759 |
| Married couple, w/children | 38.5% | 48.8% | 30.5% |
| Married couple, no children | 57.7% | 44.8% | 42.9% |
| Non Family Households | 721 | 833 | 43,255,233 |
| Single householder, w/children | 2.7% | 5.1% | 15.8% |
| Single householder, no children | 1.2% | 1.4% | 10.8% |