| | North Miami Beach, FL | St. Petersburg, PA | United States |
| Population | 43,357 | 268 | 329,725,481 |
| Female Population | 50.8% | 54.1% | 50.5% |
| Male Population | 49.2% | 45.9% | 49.5% |
| Median Age | 38.9 | 55.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 41,006 | 399 | 309,327,143 |
| Population - 2000 | 40,786 | 405 | 285,036,114 |
| Population - 1990 | 35,359 | 349 | 251,960,433 |
| Pop. 2000 to Now | 4.1% | -9.4% | 15.6% |
| Pop. 1990 to Now | 20.0% | 5.2% | 30.8% |
| space4 | | | |
| Population Density | 8,947.0 | 840.1 | 93.4 |
| Land Area | 4.8 | 0.3 | 3,531,905.4 |
| Water Area | 0.5 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | North Miami Beach, FL | St. Petersburg, PA | United States |
| Age 0 to 4 | 6.4% | 1.1% | 5.9% |
| Age 5 to 9 | 7.2% | 4.1% | 6.1% |
| Age 10 to 14 | 5.4% | 1.9% | 6.6% |
| Age 15 to 17 | 4.2% | 3.0% | 3.9% |
| Age 18 to 20 | 3.1% | 1.5% | 4.0% |
| Age 21 to 24 | 4.5% | 2.6% | 5.2% |
| Age 25 to 34 | 15.1% | 13.8% | 13.8% |
| Age 35 to 44 | 12.9% | 3.7% | 12.9% |
| Age 45 to 54 | 14.1% | 16.0% | 12.6% |
| Age 55 to 59 | 6.2% | 9.3% | 6.7% |
| Age 60 to 64 | 6.3% | 10.4% | 6.3% |
| Age 65 to 74 | 9.0% | 19.4% | 9.6% |
| Age 75 to 84 | 3.4% | 10.1% | 4.5% |
| Age 85 and over | 2.4% | 3.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | North Miami Beach, FL | St. Petersburg, PA | United States |
| White | 17.5% | 98.5% | 59.4% |
| Black | 36.1% | 0.0% | 12.2% |
| Asian | 2.5% | 0.0% | 5.6% |
| Native American | 0.2% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.1% | 0.0% | 0.2% |
| Other | 1.4% | 0.0% | 0.4% |
| Two or More Races | 1.4% | 1.5% | 3.2% |
| Hispanic | 40.8% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | North Miami Beach, FL | St. Petersburg, PA | United States |
| Married Population | 44.7% | 52.6% | 49.8% |
| Currently Married | 41.1% | 47.4% | 48.0% |
| Married but Separated | 3.6% | 5.2% | 1.8% |
| Single Population | 55.3% | 47.4% | 50.2% |
| Never Married | 39.2% | 23.7% | 33.8% |
| Divorced | 11.3% | 12.0% | 10.8% |
| Widowed | 4.9% | 11.6% | 5.6% |
| space5 | | | |
| Household Size | 2.98 | 1.97 | 2.60 |
| Households | 14,463 | 136 | 124,010,992 |
| Family Households | 10,248 | 75 | 80,755,759 |
| Married couple, w/children | 27.5% | 10.7% | 30.5% |
| Married couple, no children | 32.8% | 60.0% | 42.9% |
| Non Family Households | 4,215 | 61 | 43,255,233 |
| Single householder, w/children | 19.5% | 20.0% | 15.8% |
| Single householder, no children | 20.2% | 9.3% | 10.8% |