| | Hiram, GA | Powder Springs, GA | United States |
| Population | 4,763 | 16,698 | 329,725,481 |
| Female Population | 55.0% | 55.5% | 50.5% |
| Male Population | 45.0% | 44.5% | 49.5% |
| Median Age | 35.6 | 38 | 38.4 |
| space3 | | | |
| Population - 2010 | 3,495 | 13,966 | 309,327,143 |
| Population - 2000 | 1,361 | 12,481 | 285,036,114 |
| Population - 1990 | 1,389 | 6,893 | 251,960,433 |
| Pop. 2000 to Now | 211.0% | 26.6% | 15.6% |
| Pop. 1990 to Now | 204.8% | 129.2% | 30.8% |
| space4 | | | |
| Population Density | 1,198.5 | 2,270.9 | 93.4 |
| Land Area | 4.0 | 7.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Hiram, GA | Powder Springs, GA | United States |
| Age 0 to 4 | 7.4% | 6.7% | 5.9% |
| Age 5 to 9 | 9.6% | 6.4% | 6.1% |
| Age 10 to 14 | 5.6% | 6.7% | 6.6% |
| Age 15 to 17 | 4.0% | 5.2% | 3.9% |
| Age 18 to 20 | 2.4% | 4.5% | 4.0% |
| Age 21 to 24 | 1.5% | 4.3% | 5.2% |
| Age 25 to 34 | 15.0% | 11.8% | 13.8% |
| Age 35 to 44 | 17.3% | 14.2% | 12.9% |
| Age 45 to 54 | 15.9% | 14.2% | 12.6% |
| Age 55 to 59 | 3.4% | 8.2% | 6.7% |
| Age 60 to 64 | 3.7% | 5.0% | 6.3% |
| Age 65 to 74 | 11.2% | 8.0% | 9.6% |
| Age 75 to 84 | 2.3% | 3.9% | 4.5% |
| Age 85 and over | 0.6% | 1.0% | 1.9% |
| space1 | | | |
| Race | | | |
| | Hiram, GA | Powder Springs, GA | United States |
| White | 32.8% | 27.1% | 59.4% |
| Black | 40.4% | 50.9% | 12.2% |
| Asian | 9.5% | 1.8% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 1.6% | 1.2% | 0.4% |
| Two or More Races | 7.0% | 0.9% | 3.2% |
| Hispanic | 8.8% | 18.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Hiram, GA | Powder Springs, GA | United States |
| Married Population | 48.0% | 47.9% | 49.8% |
| Currently Married | 46.5% | 45.6% | 48.0% |
| Married but Separated | 1.4% | 2.3% | 1.8% |
| Single Population | 52.0% | 52.1% | 50.2% |
| Never Married | 29.3% | 34.8% | 33.8% |
| Divorced | 20.4% | 10.7% | 10.8% |
| Widowed | 2.4% | 6.5% | 5.6% |
| space5 | | | |
| Household Size | 2.74 | 2.85 | 2.60 |
| Households | 1,738 | 5,794 | 124,010,992 |
| Family Households | 1,146 | 4,305 | 80,755,759 |
| Married couple, w/children | 30.5% | 31.9% | 30.5% |
| Married couple, no children | 19.5% | 34.8% | 42.9% |
| Non Family Households | 592 | 1,489 | 43,255,233 |
| Single householder, w/children | 29.0% | 18.3% | 15.8% |
| Single householder, no children | 21.0% | 15.0% | 10.8% |