| | North Kansas City, MO | Rockport, MA | United States |
| Population | 4,510 | 7,014 | 329,725,481 |
| Female Population | 47.0% | 54.8% | 50.5% |
| Male Population | 53.0% | 45.2% | 49.5% |
| Median Age | 46.7 | 57.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,193 | 6,970 | 309,327,143 |
| Population - 2000 | 4,714 | 7,767 | 285,036,114 |
| Population - 1990 | 4,130 | 7,482 | 251,960,433 |
| Pop. 2000 to Now | 6.4% | -5.9% | 15.6% |
| Pop. 1990 to Now | 21.5% | -2.3% | 30.8% |
| space4 | | | |
| Population Density | 1,024.3 | 1,003.2 | 93.4 |
| Land Area | 4.4 | 7.0 | 3,531,905.4 |
| Water Area | 0.2 | 10.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | North Kansas City, MO | Rockport, MA | United States |
| Age 0 to 4 | 4.4% | 3.1% | 5.9% |
| Age 5 to 9 | 2.7% | 2.9% | 6.1% |
| Age 10 to 14 | 4.4% | 3.5% | 6.6% |
| Age 15 to 17 | 1.5% | 3.4% | 3.9% |
| Age 18 to 20 | 2.4% | 2.6% | 4.0% |
| Age 21 to 24 | 8.2% | 3.7% | 5.2% |
| Age 25 to 34 | 14.5% | 6.4% | 13.8% |
| Age 35 to 44 | 9.0% | 8.7% | 12.9% |
| Age 45 to 54 | 14.1% | 11.0% | 12.6% |
| Age 55 to 59 | 4.6% | 8.2% | 6.7% |
| Age 60 to 64 | 4.1% | 9.7% | 6.3% |
| Age 65 to 74 | 17.2% | 22.6% | 9.6% |
| Age 75 to 84 | 9.0% | 9.1% | 4.5% |
| Age 85 and over | 4.0% | 5.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | North Kansas City, MO | Rockport, MA | United States |
| White | 72.9% | 94.8% | 59.4% |
| Black | 5.6% | 0.3% | 12.2% |
| Asian | 1.3% | 0.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 1.3% | 0.4% |
| Two or More Races | 9.2% | 1.8% | 3.2% |
| Hispanic | 11.0% | 1.6% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | North Kansas City, MO | Rockport, MA | United States |
| Married Population | 26.1% | 53.2% | 49.8% |
| Currently Married | 24.3% | 52.1% | 48.0% |
| Married but Separated | 1.7% | 1.1% | 1.8% |
| Single Population | 73.9% | 46.8% | 50.2% |
| Never Married | 39.9% | 24.9% | 33.8% |
| Divorced | 28.8% | 13.3% | 10.8% |
| Widowed | 5.2% | 8.6% | 5.6% |
| space5 | | | |
| Household Size | 1.65 | 2.10 | 2.60 |
| Households | 2,735 | 3,319 | 124,010,992 |
| Family Households | 953 | 2,041 | 80,755,759 |
| Married couple, w/children | 12.8% | 15.7% | 30.5% |
| Married couple, no children | 35.9% | 61.8% | 42.9% |
| Non Family Households | 1,782 | 1,278 | 43,255,233 |
| Single householder, w/children | 25.4% | 11.0% | 15.8% |
| Single householder, no children | 25.9% | 11.6% | 10.8% |