| | North St. Paul, MN | Mendota Heights, MN | United States |
| Population | 12,395 | 11,681 | 329,725,481 |
| Female Population | 50.3% | 50.3% | 50.5% |
| Male Population | 49.7% | 49.7% | 49.5% |
| Median Age | 32.1 | 46.5 | 38.4 |
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| Population - 2010 | 11,477 | 11,080 | 309,327,143 |
| Population - 2000 | 11,929 | 11,434 | 285,036,114 |
| Population - 1990 | 12,335 | 9,431 | 251,960,433 |
| Pop. 2000 to Now | 4.1% | 0.0% | 15.6% |
| Pop. 1990 to Now | 0.7% | 21.2% | 30.8% |
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| Population Density | 4,335.4 | 1,284.9 | 93.4 |
| Land Area | 2.9 | 9.1 | 3,531,905.4 |
| Water Area | 0.2 | 1.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | North St. Paul, MN | Mendota Heights, MN | United States |
| Age 0 to 4 | 10.2% | 5.7% | 5.9% |
| Age 5 to 9 | 8.5% | 4.3% | 6.1% |
| Age 10 to 14 | 4.3% | 6.1% | 6.6% |
| Age 15 to 17 | 2.8% | 5.8% | 3.9% |
| Age 18 to 20 | 2.9% | 4.4% | 4.0% |
| Age 21 to 24 | 6.1% | 3.2% | 5.2% |
| Age 25 to 34 | 19.1% | 8.6% | 13.8% |
| Age 35 to 44 | 9.9% | 10.7% | 12.9% |
| Age 45 to 54 | 12.0% | 11.5% | 12.6% |
| Age 55 to 59 | 6.1% | 7.6% | 6.7% |
| Age 60 to 64 | 4.4% | 8.4% | 6.3% |
| Age 65 to 74 | 9.3% | 14.0% | 9.6% |
| Age 75 to 84 | 3.1% | 7.2% | 4.5% |
| Age 85 and over | 1.2% | 2.4% | 1.9% |
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| Race | | | |
| | North St. Paul, MN | Mendota Heights, MN | United States |
| White | 60.8% | 83.9% | 59.4% |
| Black | 9.9% | 0.6% | 12.2% |
| Asian | 16.5% | 2.9% | 5.6% |
| Native American | 0.1% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.1% | 0.4% |
| Two or More Races | 6.9% | 9.6% | 3.2% |
| Hispanic | 5.9% | 3.0% | 18.4% |
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| Marriage & Family | | | |
| | North St. Paul, MN | Mendota Heights, MN | United States |
| Married Population | 43.7% | 61.3% | 49.8% |
| Currently Married | 41.2% | 60.2% | 48.0% |
| Married but Separated | 2.4% | 1.1% | 1.8% |
| Single Population | 56.3% | 38.7% | 50.2% |
| Never Married | 42.1% | 26.3% | 33.8% |
| Divorced | 7.9% | 8.7% | 10.8% |
| Widowed | 6.3% | 3.6% | 5.6% |
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| Household Size | 2.68 | 2.47 | 2.60 |
| Households | 4,593 | 4,694 | 124,010,992 |
| Family Households | 3,018 | 3,405 | 80,755,759 |
| Married couple, w/children | 24.6% | 28.8% | 30.5% |
| Married couple, no children | 35.8% | 57.3% | 42.9% |
| Non Family Households | 1,575 | 1,289 | 43,255,233 |
| Single householder, w/children | 23.7% | 10.7% | 15.8% |
| Single householder, no children | 15.9% | 3.1% | 10.8% |