| | Missouri City, MO | Harrisburg, AR | United States |
| Population | 327 | 2,700 | 329,725,481 |
| Female Population | 41.6% | 50.8% | 50.5% |
| Male Population | 58.4% | 49.2% | 49.5% |
| Median Age | 55.2 | 37.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 273 | 2,310 | 309,327,143 |
| Population - 2000 | 295 | 2,192 | 285,036,114 |
| Population - 1990 | 348 | 1,943 | 251,960,433 |
| Pop. 2000 to Now | 0.7% | 4.4% | 15.6% |
| Pop. 1990 to Now | -14.7% | 17.8% | 30.8% |
| space4 | | | |
| Population Density | 366.2 | 1,146.0 | 93.4 |
| Land Area | 0.9 | 2.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Missouri City, MO | Harrisburg, AR | United States |
| Age 0 to 4 | 2.4% | 5.7% | 5.9% |
| Age 5 to 9 | 3.7% | 9.1% | 6.1% |
| Age 10 to 14 | 4.3% | 5.7% | 6.6% |
| Age 15 to 17 | 0.3% | 5.6% | 3.9% |
| Age 18 to 20 | 2.1% | 6.7% | 4.0% |
| Age 21 to 24 | 1.2% | 3.1% | 5.2% |
| Age 25 to 34 | 6.4% | 10.1% | 13.8% |
| Age 35 to 44 | 10.7% | 13.7% | 12.9% |
| Age 45 to 54 | 18.3% | 12.1% | 12.6% |
| Age 55 to 59 | 7.0% | 5.1% | 6.7% |
| Age 60 to 64 | 11.3% | 4.8% | 6.3% |
| Age 65 to 74 | 16.2% | 9.9% | 9.6% |
| Age 75 to 84 | 2.8% | 4.8% | 4.5% |
| Age 85 and over | 13.2% | 3.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Missouri City, MO | Harrisburg, AR | United States |
| White | 85.9% | 91.0% | 59.4% |
| Black | 5.5% | 1.6% | 12.2% |
| Asian | 1.5% | 0.0% | 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 | 3.7% | 5.7% | 3.2% |
| Hispanic | 3.4% | 1.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Missouri City, MO | Harrisburg, AR | United States |
| Married Population | 62.5% | 46.8% | 49.8% |
| Currently Married | 61.4% | 44.3% | 48.0% |
| Married but Separated | 1.0% | 2.5% | 1.8% |
| Single Population | 37.5% | 53.2% | 50.2% |
| Never Married | 10.9% | 27.6% | 33.8% |
| Divorced | 19.1% | 16.0% | 10.8% |
| Widowed | 7.5% | 9.6% | 5.6% |
| space5 | | | |
| Household Size | 2.03 | 2.70 | 2.60 |
| Households | 161 | 948 | 124,010,992 |
| Family Households | 92 | 700 | 80,755,759 |
| Married couple, w/children | 13.0% | 23.0% | 30.5% |
| Married couple, no children | 76.1% | 40.9% | 42.9% |
| Non Family Households | 69 | 248 | 43,255,233 |
| Single householder, w/children | 4.3% | 24.6% | 15.8% |
| Single householder, no children | 6.5% | 11.6% | 10.8% |