| | Northrop, MN | North Mankato, MN | United States |
| Population | 223 | 14,356 | 329,725,481 |
| Female Population | 45.7% | 50.6% | 50.5% |
| Male Population | 54.3% | 49.4% | 49.5% |
| Median Age | 44.5 | 37 | 38.4 |
| space3 | | | |
| Population - 2010 | 227 | 13,423 | 309,327,143 |
| Population - 2000 | 262 | 11,798 | 285,036,114 |
| Population - 1990 | 276 | 10,164 | 251,960,433 |
| Pop. 2000 to Now | -19.5% | 19.1% | 15.6% |
| Pop. 1990 to Now | -23.6% | 38.3% | 30.8% |
| space4 | | | |
| Population Density | 1,702.3 | 2,317.4 | 93.4 |
| Land Area | 0.1 | 6.2 | 3,531,905.4 |
| Water Area | 0.0 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Northrop, MN | North Mankato, MN | United States |
| Age 0 to 4 | 5.8% | 6.5% | 5.9% |
| Age 5 to 9 | 4.5% | 7.3% | 6.1% |
| Age 10 to 14 | 4.5% | 8.5% | 6.6% |
| Age 15 to 17 | 1.3% | 3.4% | 3.9% |
| Age 18 to 20 | 4.5% | 2.3% | 4.0% |
| Age 21 to 24 | 3.1% | 4.7% | 5.2% |
| Age 25 to 34 | 8.1% | 13.1% | 13.8% |
| Age 35 to 44 | 18.8% | 14.4% | 12.9% |
| Age 45 to 54 | 1.3% | 12.5% | 12.6% |
| Age 55 to 59 | 9.9% | 5.2% | 6.7% |
| Age 60 to 64 | 3.6% | 6.6% | 6.3% |
| Age 65 to 74 | 24.7% | 8.2% | 9.6% |
| Age 75 to 84 | 9.9% | 5.0% | 4.5% |
| Age 85 and over | 0.0% | 2.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Northrop, MN | North Mankato, MN | United States |
| White | 97.8% | 86.5% | 59.4% |
| Black | 0.0% | 2.2% | 12.2% |
| Asian | 0.0% | 2.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 0.0% | 4.7% | 3.2% |
| Hispanic | 2.2% | 4.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Northrop, MN | North Mankato, MN | United States |
| Married Population | 49.5% | 53.5% | 49.8% |
| Currently Married | 49.5% | 52.3% | 48.0% |
| Married but Separated | 0.0% | 1.2% | 1.8% |
| Single Population | 50.5% | 46.5% | 50.2% |
| Never Married | 24.2% | 30.5% | 33.8% |
| Divorced | 12.6% | 10.8% | 10.8% |
| Widowed | 13.7% | 5.2% | 5.6% |
| space5 | | | |
| Household Size | 2.06 | 2.43 | 2.60 |
| Households | 108 | 5,861 | 124,010,992 |
| Family Households | 54 | 3,701 | 80,755,759 |
| Married couple, w/children | 31.5% | 30.2% | 30.5% |
| Married couple, no children | 50.0% | 45.5% | 42.9% |
| Non Family Households | 54 | 2,160 | 43,255,233 |
| Single householder, w/children | 18.5% | 17.6% | 15.8% |
| Single householder, no children | 0.0% | 6.6% | 10.8% |