| | Mar-Mac, NC | Elroy, NC | United States |
| Population | 2,576 | 3,837 | 329,725,481 |
| Female Population | 50.5% | 50.3% | 50.5% |
| Male Population | 49.5% | 49.8% | 49.5% |
| Median Age | 33.8 | 38.7 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,401 | 3,890 | 309,327,143 |
| Population - 2000 | 3,004 | 3,896 | 285,036,114 |
| Population - 1990 | 3,282 | 4,028 | 251,960,433 |
| Pop. 2000 to Now | -0.4% | -12.9% | 15.6% |
| Pop. 1990 to Now | -8.8% | -15.8% | 30.8% |
| space4 | | | |
| Population Density | 566.3 | 586.8 | 93.4 |
| Land Area | 4.5 | 6.5 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Mar-Mac, NC | Elroy, NC | United States |
| Age 0 to 4 | 5.0% | 8.1% | 5.9% |
| Age 5 to 9 | 12.7% | 5.9% | 6.1% |
| Age 10 to 14 | 7.7% | 6.0% | 6.6% |
| Age 15 to 17 | 0.7% | 2.4% | 3.9% |
| Age 18 to 20 | 5.7% | 6.8% | 4.0% |
| Age 21 to 24 | 3.5% | 3.8% | 5.2% |
| Age 25 to 34 | 15.2% | 15.6% | 13.8% |
| Age 35 to 44 | 11.3% | 12.0% | 12.9% |
| Age 45 to 54 | 8.9% | 13.1% | 12.6% |
| Age 55 to 59 | 8.0% | 6.9% | 6.7% |
| Age 60 to 64 | 2.7% | 5.6% | 6.3% |
| Age 65 to 74 | 9.6% | 9.3% | 9.6% |
| Age 75 to 84 | 6.2% | 3.4% | 4.5% |
| Age 85 and over | 2.9% | 1.3% | 1.9% |
| space1 | | | |
| Race | | | |
| | Mar-Mac, NC | Elroy, NC | United States |
| White | 51.1% | 53.3% | 59.4% |
| Black | 28.6% | 29.1% | 12.2% |
| Asian | 0.5% | 3.1% | 5.6% |
| Native American | 0.0% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 0.0% | 3.4% | 3.2% |
| Hispanic | 19.7% | 10.9% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Mar-Mac, NC | Elroy, NC | United States |
| Married Population | 38.4% | 46.4% | 49.8% |
| Currently Married | 38.4% | 41.9% | 48.0% |
| Married but Separated | 0.0% | 4.5% | 1.8% |
| Single Population | 61.6% | 53.6% | 50.2% |
| Never Married | 36.3% | 28.7% | 33.8% |
| Divorced | 15.2% | 17.7% | 10.8% |
| Widowed | 10.1% | 7.2% | 5.6% |
| space5 | | | |
| Household Size | 2.15 | 2.55 | 2.60 |
| Households | 1,197 | 1,507 | 124,010,992 |
| Family Households | 667 | 1,001 | 80,755,759 |
| Married couple, w/children | 24.1% | 22.5% | 30.5% |
| Married couple, no children | 31.6% | 37.9% | 42.9% |
| Non Family Households | 530 | 506 | 43,255,233 |
| Single householder, w/children | 30.1% | 27.1% | 15.8% |
| Single householder, no children | 14.1% | 12.6% | 10.8% |