| | Mount Pleasant, NC | Liberty, NC | United States |
| Population | 1,981 | 2,660 | 329,725,481 |
| Female Population | 56.2% | 50.3% | 50.5% |
| Male Population | 43.8% | 49.7% | 49.5% |
| Median Age | 42.9 | 42.7 | 38.4 |
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| Population - 2010 | 1,847 | 2,659 | 309,327,143 |
| Population - 2000 | 1,259 | 2,661 | 285,036,114 |
| Population - 1990 | 1,027 | 2,047 | 251,960,433 |
| Pop. 2000 to Now | 76.8% | 0.4% | 15.6% |
| Pop. 1990 to Now | 116.8% | 30.5% | 30.8% |
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| Population Density | 592.8 | 848.8 | 93.4 |
| Land Area | 3.3 | 3.1 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mount Pleasant, NC | Liberty, NC | United States |
| Age 0 to 4 | 2.7% | 5.3% | 5.9% |
| Age 5 to 9 | 4.2% | 5.6% | 6.1% |
| Age 10 to 14 | 8.3% | 4.8% | 6.6% |
| Age 15 to 17 | 4.6% | 5.0% | 3.9% |
| Age 18 to 20 | 3.1% | 2.1% | 4.0% |
| Age 21 to 24 | 8.2% | 5.5% | 5.2% |
| Age 25 to 34 | 10.3% | 12.7% | 13.8% |
| Age 35 to 44 | 11.8% | 9.5% | 12.9% |
| Age 45 to 54 | 17.7% | 12.7% | 12.6% |
| Age 55 to 59 | 5.4% | 7.6% | 6.7% |
| Age 60 to 64 | 2.5% | 6.6% | 6.3% |
| Age 65 to 74 | 8.1% | 13.9% | 9.6% |
| Age 75 to 84 | 4.9% | 5.0% | 4.5% |
| Age 85 and over | 8.2% | 3.7% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mount Pleasant, NC | Liberty, NC | United States |
| White | 69.8% | 54.4% | 59.4% |
| Black | 22.7% | 21.1% | 12.2% |
| Asian | 2.6% | 1.1% | 5.6% |
| Native American | 0.2% | 0.5% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 0.0% | 3.6% | 3.2% |
| Hispanic | 4.8% | 19.3% | 18.4% |
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| Marriage & Family | | | |
| | Mount Pleasant, NC | Liberty, NC | United States |
| Married Population | 48.8% | 41.1% | 49.8% |
| Currently Married | 46.4% | 38.3% | 48.0% |
| Married but Separated | 2.4% | 2.8% | 1.8% |
| Single Population | 51.3% | 58.9% | 50.2% |
| Never Married | 27.7% | 38.5% | 33.8% |
| Divorced | 15.0% | 10.2% | 10.8% |
| Widowed | 8.5% | 10.2% | 5.6% |
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| Household Size | 2.96 | 2.43 | 2.60 |
| Households | 652 | 1,087 | 124,010,992 |
| Family Households | 475 | 658 | 80,755,759 |
| Married couple, w/children | 24.6% | 24.2% | 30.5% |
| Married couple, no children | 42.9% | 41.2% | 42.9% |
| Non Family Households | 177 | 429 | 43,255,233 |
| Single householder, w/children | 18.9% | 17.0% | 15.8% |
| Single householder, no children | 13.5% | 17.6% | 10.8% |