| | Hannibal, MO | Palm Harbor, FL | United States |
| Population | 17,165 | 60,682 | 329,725,481 |
| Female Population | 52.5% | 52.8% | 50.5% |
| Male Population | 47.5% | 47.2% | 49.5% |
| Median Age | 38 | 50.1 | 38.4 |
| space3 | | | |
| Population - 2010 | 17,771 | 58,212 | 309,327,143 |
| Population - 2000 | 17,757 | 59,248 | 285,036,114 |
| Population - 1990 | 18,004 | 50,256 | 251,960,433 |
| Pop. 2000 to Now | -2.9% | 7.1% | 15.6% |
| Pop. 1990 to Now | -4.2% | 26.3% | 30.8% |
| space4 | | | |
| Population Density | 1,090.9 | 3,498.9 | 93.4 |
| Land Area | 15.7 | 17.3 | 3,531,905.4 |
| Water Area | 0.5 | 10.7 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hannibal, MO | Palm Harbor, FL | United States |
| Age 0 to 4 | 6.3% | 3.6% | 5.9% |
| Age 5 to 9 | 6.1% | 4.2% | 6.1% |
| Age 10 to 14 | 7.8% | 4.8% | 6.6% |
| Age 15 to 17 | 3.5% | 3.5% | 3.9% |
| Age 18 to 20 | 5.1% | 2.5% | 4.0% |
| Age 21 to 24 | 5.9% | 3.2% | 5.2% |
| Age 25 to 34 | 11.8% | 10.7% | 13.8% |
| Age 35 to 44 | 10.3% | 10.3% | 12.9% |
| Age 45 to 54 | 10.7% | 13.6% | 12.6% |
| Age 55 to 59 | 5.6% | 8.2% | 6.7% |
| Age 60 to 64 | 8.2% | 8.2% | 6.3% |
| Age 65 to 74 | 10.7% | 14.0% | 9.6% |
| Age 75 to 84 | 4.7% | 8.4% | 4.5% |
| Age 85 and over | 3.1% | 4.8% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hannibal, MO | Palm Harbor, FL | United States |
| White | 87.1% | 84.7% | 59.4% |
| Black | 6.1% | 2.0% | 12.2% |
| Asian | 0.5% | 3.0% | 5.6% |
| Native American | 0.2% | 0.3% | 0.6% |
| Hawaiian, Pacific Islander | 0.2% | 0.0% | 0.2% |
| Other | 0.3% | 0.3% | 0.4% |
| Two or More Races | 2.7% | 2.0% | 3.2% |
| Hispanic | 3.0% | 7.8% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hannibal, MO | Palm Harbor, FL | United States |
| Married Population | 45.5% | 50.7% | 49.8% |
| Currently Married | 44.2% | 49.5% | 48.0% |
| Married but Separated | 1.3% | 1.2% | 1.8% |
| Single Population | 54.5% | 49.3% | 50.2% |
| Never Married | 31.9% | 26.0% | 33.8% |
| Divorced | 15.2% | 13.1% | 10.8% |
| Widowed | 7.4% | 10.2% | 5.6% |
| space5 | | | |
| Household Size | 2.28 | 2.25 | 2.60 |
| Households | 6,988 | 26,733 | 124,010,992 |
| Family Households | 4,195 | 15,998 | 80,755,759 |
| Married couple, w/children | 26.5% | 22.6% | 30.5% |
| Married couple, no children | 42.2% | 56.3% | 42.9% |
| Non Family Households | 2,793 | 10,735 | 43,255,233 |
| Single householder, w/children | 24.6% | 12.0% | 15.8% |
| Single householder, no children | 6.7% | 9.2% | 10.8% |