| | Madeira Beach, FL | Dunedin, FL | United States |
| Population | 3,947 | 36,110 | 329,725,481 |
| Female Population | 45.2% | 54.3% | 50.5% |
| Male Population | 54.8% | 45.7% | 49.5% |
| Median Age | 60 | 57.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 4,179 | 35,321 | 309,327,143 |
| Population - 2000 | 4,511 | 35,691 | 285,036,114 |
| Population - 1990 | 4,225 | 34,012 | 251,960,433 |
| Pop. 2000 to Now | -5.2% | 2.2% | 15.6% |
| Pop. 1990 to Now | 1.2% | 7.2% | 30.8% |
| space4 | | | |
| Population Density | 4,019.4 | 3,470.8 | 93.4 |
| Land Area | 1.0 | 10.4 | 3,531,905.4 |
| Water Area | 2.2 | 12.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Madeira Beach, FL | Dunedin, FL | United States |
| Age 0 to 4 | 1.7% | 3.3% | 5.9% |
| Age 5 to 9 | 0.5% | 2.3% | 6.1% |
| Age 10 to 14 | 1.0% | 2.7% | 6.6% |
| Age 15 to 17 | 1.1% | 2.3% | 3.9% |
| Age 18 to 20 | 1.8% | 2.0% | 4.0% |
| Age 21 to 24 | 6.6% | 2.7% | 5.2% |
| Age 25 to 34 | 5.1% | 8.6% | 13.8% |
| Age 35 to 44 | 5.3% | 8.6% | 12.9% |
| Age 45 to 54 | 10.8% | 13.0% | 12.6% |
| Age 55 to 59 | 16.0% | 9.6% | 6.7% |
| Age 60 to 64 | 19.5% | 8.6% | 6.3% |
| Age 65 to 74 | 17.9% | 20.5% | 9.6% |
| Age 75 to 84 | 9.2% | 10.4% | 4.5% |
| Age 85 and over | 3.4% | 5.4% | 1.9% |
| space1 | | | |
| Race | | | |
| | Madeira Beach, FL | Dunedin, FL | United States |
| White | 89.2% | 88.7% | 59.4% |
| Black | 0.3% | 2.5% | 12.2% |
| Asian | 0.2% | 1.6% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 2.3% | 1.8% | 3.2% |
| Hispanic | 8.0% | 5.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Madeira Beach, FL | Dunedin, FL | United States |
| Married Population | 54.5% | 49.0% | 49.8% |
| Currently Married | 54.0% | 47.8% | 48.0% |
| Married but Separated | 0.4% | 1.2% | 1.8% |
| Single Population | 45.5% | 51.0% | 50.2% |
| Never Married | 20.0% | 22.7% | 33.8% |
| Divorced | 18.0% | 17.3% | 10.8% |
| Widowed | 7.5% | 11.0% | 5.6% |
| space5 | | | |
| Household Size | 2.05 | 1.95 | 2.60 |
| Households | 1,924 | 18,254 | 124,010,992 |
| Family Households | 1,112 | 9,585 | 80,755,759 |
| Married couple, w/children | 11.9% | 15.1% | 30.5% |
| Married couple, no children | 78.3% | 65.1% | 42.9% |
| Non Family Households | 812 | 8,669 | 43,255,233 |
| Single householder, w/children | 1.3% | 8.4% | 15.8% |
| Single householder, no children | 8.5% | 11.5% | 10.8% |