| | Cardwell, MO | Senath, MO | United States |
| Population | 726 | 1,580 | 329,725,481 |
| Female Population | 53.9% | 53.0% | 50.5% |
| Male Population | 46.1% | 47.0% | 49.5% |
| Median Age | 23.6 | 32.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 713 | 1,767 | 309,327,143 |
| Population - 2000 | 789 | 1,650 | 285,036,114 |
| Population - 1990 | 792 | 1,622 | 251,960,433 |
| Pop. 2000 to Now | -19.8% | -3.3% | 15.6% |
| Pop. 1990 to Now | -20.1% | -1.6% | 30.8% |
| space4 | | | |
| Population Density | 1,152.4 | 821.2 | 93.4 |
| Land Area | 0.6 | 1.9 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Cardwell, MO | Senath, MO | United States |
| Age 0 to 4 | 11.0% | 10.9% | 5.9% |
| Age 5 to 9 | 2.1% | 8.8% | 6.1% |
| Age 10 to 14 | 7.3% | 7.0% | 6.6% |
| Age 15 to 17 | 3.4% | 5.6% | 3.9% |
| Age 18 to 20 | 14.6% | 3.8% | 4.0% |
| Age 21 to 24 | 17.6% | 4.8% | 5.2% |
| Age 25 to 34 | 7.0% | 12.4% | 13.8% |
| Age 35 to 44 | 7.7% | 15.5% | 12.9% |
| Age 45 to 54 | 9.2% | 13.8% | 12.6% |
| Age 55 to 59 | 4.0% | 1.6% | 6.7% |
| Age 60 to 64 | 5.2% | 3.9% | 6.3% |
| Age 65 to 74 | 6.1% | 6.8% | 9.6% |
| Age 75 to 84 | 4.4% | 3.4% | 4.5% |
| Age 85 and over | 0.3% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Cardwell, MO | Senath, MO | United States |
| White | 88.8% | 54.9% | 59.4% |
| Black | 0.0% | 1.1% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.4% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 4.8% | 0.5% | 3.2% |
| Hispanic | 5.9% | 43.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Cardwell, MO | Senath, MO | United States |
| Married Population | 33.2% | 46.2% | 49.8% |
| Currently Married | 26.5% | 43.0% | 48.0% |
| Married but Separated | 6.7% | 3.2% | 1.8% |
| Single Population | 66.8% | 53.8% | 50.2% |
| Never Married | 49.1% | 35.8% | 33.8% |
| Divorced | 9.2% | 11.8% | 10.8% |
| Widowed | 8.5% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.41 | 3.06 | 2.60 |
| Households | 301 | 493 | 124,010,992 |
| Family Households | 151 | 367 | 80,755,759 |
| Married couple, w/children | 22.5% | 27.2% | 30.5% |
| Married couple, no children | 35.1% | 31.6% | 42.9% |
| Non Family Households | 150 | 126 | 43,255,233 |
| Single householder, w/children | 26.5% | 37.6% | 15.8% |
| Single householder, no children | 15.9% | 3.5% | 10.8% |