| | Marine on St. Croix, MN | Orono, MN | United States |
| Population | 682 | 8,252 | 329,725,481 |
| Female Population | 53.5% | 43.6% | 50.5% |
| Male Population | 46.5% | 56.5% | 49.5% |
| Median Age | 56.4 | 45.4 | 38.4 |
| space3 | | | |
| Population - 2010 | 689 | 7,447 | 309,327,143 |
| Population - 2000 | 602 | 7,538 | 285,036,114 |
| Population - 1990 | 610 | 7,285 | 251,960,433 |
| Pop. 2000 to Now | 17.4% | 10.8% | 15.6% |
| Pop. 1990 to Now | 15.9% | 14.6% | 30.8% |
| space4 | | | |
| Population Density | 174.5 | 518.1 | 93.4 |
| Land Area | 3.9 | 15.9 | 3,531,905.4 |
| Water Area | 0.3 | 9.4 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Marine on St. Croix, MN | Orono, MN | United States |
| Age 0 to 4 | 5.9% | 7.9% | 5.9% |
| Age 5 to 9 | 6.5% | 6.3% | 6.1% |
| Age 10 to 14 | 5.9% | 7.2% | 6.6% |
| Age 15 to 17 | 1.9% | 4.3% | 3.9% |
| Age 18 to 20 | 0.4% | 2.7% | 4.0% |
| Age 21 to 24 | 1.3% | 0.9% | 5.2% |
| Age 25 to 34 | 5.4% | 5.8% | 13.8% |
| Age 35 to 44 | 11.4% | 14.5% | 12.9% |
| Age 45 to 54 | 9.8% | 14.5% | 12.6% |
| Age 55 to 59 | 9.2% | 12.7% | 6.7% |
| Age 60 to 64 | 10.7% | 7.2% | 6.3% |
| Age 65 to 74 | 17.3% | 12.8% | 9.6% |
| Age 75 to 84 | 10.6% | 2.4% | 4.5% |
| Age 85 and over | 3.7% | 0.9% | 1.9% |
| space1 | | | |
| Race | | | |
| | Marine on St. Croix, MN | Orono, MN | United States |
| White | 92.4% | 92.6% | 59.4% |
| Black | 0.0% | 0.0% | 12.2% |
| Asian | 0.1% | 6.0% | 5.6% |
| Native American | 5.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.3% | 1.3% | 3.2% |
| Hispanic | 0.1% | 0.0% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Marine on St. Croix, MN | Orono, MN | United States |
| Married Population | 72.6% | 71.6% | 49.8% |
| Currently Married | 72.4% | 71.6% | 48.0% |
| Married but Separated | 0.2% | 0.0% | 1.8% |
| Single Population | 27.4% | 28.4% | 50.2% |
| Never Married | 12.2% | 17.0% | 33.8% |
| Divorced | 9.7% | 10.4% | 10.8% |
| Widowed | 5.6% | 1.0% | 5.6% |
| space5 | | | |
| Household Size | 2.29 | 2.71 | 2.60 |
| Households | 298 | 3,039 | 124,010,992 |
| Family Households | 201 | 2,413 | 80,755,759 |
| Married couple, w/children | 25.4% | 42.3% | 30.5% |
| Married couple, no children | 68.7% | 50.0% | 42.9% |
| Non Family Households | 97 | 626 | 43,255,233 |
| Single householder, w/children | 4.0% | 5.3% | 15.8% |
| Single householder, no children | 2.0% | 2.4% | 10.8% |