| | Newnan, GA | Martinez, GA | United States |
| Population | 41,598 | 33,829 | 329,725,481 |
| Female Population | 54.0% | 53.4% | 50.5% |
| Male Population | 46.0% | 46.6% | 49.5% |
| Median Age | 34.9 | 38.3 | 38.4 |
| space3 | | | |
| Population - 2010 | 33,019 | 34,895 | 309,327,143 |
| Population - 2000 | 16,242 | 27,749 | 285,036,114 |
| Population - 1990 | 12,497 | 33,731 | 251,960,433 |
| Pop. 2000 to Now | 164.0% | 43.7% | 15.6% |
| Pop. 1990 to Now | 243.2% | 18.2% | 30.8% |
| space4 | | | |
| Population Density | 2,166.8 | 2,332.6 | 93.4 |
| Land Area | 19.2 | 14.5 | 3,531,905.4 |
| Water Area | 0.3 | 0.1 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Newnan, GA | Martinez, GA | United States |
| Age 0 to 4 | 7.3% | 6.9% | 5.9% |
| Age 5 to 9 | 7.3% | 6.5% | 6.1% |
| Age 10 to 14 | 6.2% | 7.7% | 6.6% |
| Age 15 to 17 | 5.0% | 3.9% | 3.9% |
| Age 18 to 20 | 3.8% | 3.3% | 4.0% |
| Age 21 to 24 | 4.4% | 4.0% | 5.2% |
| Age 25 to 34 | 16.2% | 13.7% | 13.8% |
| Age 35 to 44 | 14.1% | 13.3% | 12.9% |
| Age 45 to 54 | 12.1% | 13.0% | 12.6% |
| Age 55 to 59 | 6.3% | 6.6% | 6.7% |
| Age 60 to 64 | 4.9% | 6.4% | 6.3% |
| Age 65 to 74 | 7.9% | 8.7% | 9.6% |
| Age 75 to 84 | 3.7% | 3.8% | 4.5% |
| Age 85 and over | 0.8% | 2.2% | 1.9% |
| space1 | | | |
| Race | | | |
| | Newnan, GA | Martinez, GA | United States |
| White | 49.8% | 70.7% | 59.4% |
| Black | 33.8% | 13.5% | 12.2% |
| Asian | 3.2% | 6.4% | 5.6% |
| Native American | 0.1% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.4% | 0.4% |
| Two or More Races | 4.3% | 3.5% | 3.2% |
| Hispanic | 8.6% | 5.4% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Newnan, GA | Martinez, GA | United States |
| Married Population | 48.9% | 49.6% | 49.8% |
| Currently Married | 47.5% | 47.6% | 48.0% |
| Married but Separated | 1.4% | 2.0% | 1.8% |
| Single Population | 51.1% | 50.4% | 50.2% |
| Never Married | 34.3% | 30.9% | 33.8% |
| Divorced | 10.9% | 13.4% | 10.8% |
| Widowed | 6.0% | 6.1% | 5.6% |
| space5 | | | |
| Household Size | 2.60 | 2.90 | 2.60 |
| Households | 15,832 | 11,656 | 124,010,992 |
| Family Households | 10,377 | 7,908 | 80,755,759 |
| Married couple, w/children | 34.0% | 32.1% | 30.5% |
| Married couple, no children | 33.2% | 43.6% | 42.9% |
| Non Family Households | 5,455 | 3,748 | 43,255,233 |
| Single householder, w/children | 21.7% | 17.7% | 15.8% |
| Single householder, no children | 11.1% | 6.7% | 10.8% |