| | Summerfield, NC | Apex, NC | United States |
| Population | 11,026 | 58,066 | 329,725,481 |
| Female Population | 52.9% | 51.1% | 50.5% |
| Male Population | 47.1% | 49.0% | 49.5% |
| Median Age | 45.6 | 36.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 10,265 | 38,067 | 309,327,143 |
| Population - 2000 | 7,018 | 20,212 | 285,036,114 |
| Population - 1990 | 2,051 | 4,968 | 251,960,433 |
| Pop. 2000 to Now | 63.9% | 218.6% | 15.6% |
| Pop. 1990 to Now | 460.8% | 1,196.1% | 30.8% |
| space4 | | | |
| Population Density | 416.2 | 3,041.1 | 93.4 |
| Land Area | 26.5 | 19.1 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Summerfield, NC | Apex, NC | United States |
| Age 0 to 4 | 5.2% | 6.2% | 5.9% |
| Age 5 to 9 | 4.6% | 8.2% | 6.1% |
| Age 10 to 14 | 6.7% | 9.3% | 6.6% |
| Age 15 to 17 | 6.4% | 5.2% | 3.9% |
| Age 18 to 20 | 4.3% | 3.2% | 4.0% |
| Age 21 to 24 | 3.7% | 2.9% | 5.2% |
| Age 25 to 34 | 7.7% | 12.8% | 13.8% |
| Age 35 to 44 | 10.4% | 16.7% | 12.9% |
| Age 45 to 54 | 19.5% | 16.9% | 12.6% |
| Age 55 to 59 | 10.1% | 6.3% | 6.7% |
| Age 60 to 64 | 6.0% | 3.9% | 6.3% |
| Age 65 to 74 | 9.6% | 5.4% | 9.6% |
| Age 75 to 84 | 4.0% | 1.8% | 4.5% |
| Age 85 and over | 1.9% | 1.1% | 1.9% |
| space1 | | | |
| Race | | | |
| | Summerfield, NC | Apex, NC | United States |
| White | 86.0% | 72.1% | 59.4% |
| Black | 4.3% | 7.4% | 12.2% |
| Asian | 3.2% | 9.8% | 5.6% |
| Native American | 0.0% | 0.2% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.1% | 0.2% |
| Other | 0.1% | 0.4% | 0.4% |
| Two or More Races | 2.7% | 3.7% | 3.2% |
| Hispanic | 3.7% | 6.2% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Summerfield, NC | Apex, NC | United States |
| Married Population | 65.0% | 63.7% | 49.8% |
| Currently Married | 63.8% | 62.2% | 48.0% |
| Married but Separated | 1.2% | 1.5% | 1.8% |
| Single Population | 35.0% | 36.3% | 50.2% |
| Never Married | 24.4% | 24.8% | 33.8% |
| Divorced | 7.8% | 8.5% | 10.8% |
| Widowed | 2.9% | 3.0% | 5.6% |
| space5 | | | |
| Household Size | 2.79 | 2.83 | 2.60 |
| Households | 3,950 | 20,434 | 124,010,992 |
| Family Households | 3,160 | 15,521 | 80,755,759 |
| Married couple, w/children | 34.5% | 48.8% | 30.5% |
| Married couple, no children | 51.0% | 35.0% | 42.9% |
| Non Family Households | 790 | 4,913 | 43,255,233 |
| Single householder, w/children | 8.9% | 11.4% | 15.8% |
| Single householder, no children | 5.6% | 4.7% | 10.8% |