| | Martinez, GA | Evans, GA | United States |
| Population | 33,829 | 38,452 | 329,725,481 |
| Female Population | 53.4% | 49.5% | 50.5% |
| Male Population | 46.6% | 50.5% | 49.5% |
| Median Age | 38.3 | 39.9 | 38.4 |
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| Population - 2010 | 34,895 | 27,793 | 309,327,143 |
| Population - 2000 | 27,749 | 17,727 | 285,036,114 |
| Population - 1990 | 33,731 | 13,713 | 251,960,433 |
| Pop. 2000 to Now | 43.7% | 121.2% | 15.6% |
| Pop. 1990 to Now | 18.2% | 185.9% | 30.8% |
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| Population Density | 2,332.6 | 1,522.4 | 93.4 |
| Land Area | 14.5 | 25.3 | 3,531,905.4 |
| Water Area | 0.1 | 1.3 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Martinez, GA | Evans, GA | United States |
| Age 0 to 4 | 6.9% | 5.4% | 5.9% |
| Age 5 to 9 | 6.5% | 6.7% | 6.1% |
| Age 10 to 14 | 7.7% | 8.6% | 6.6% |
| Age 15 to 17 | 3.9% | 5.4% | 3.9% |
| Age 18 to 20 | 3.3% | 3.9% | 4.0% |
| Age 21 to 24 | 4.0% | 4.0% | 5.2% |
| Age 25 to 34 | 13.7% | 10.6% | 13.8% |
| Age 35 to 44 | 13.3% | 11.9% | 12.9% |
| Age 45 to 54 | 13.0% | 14.9% | 12.6% |
| Age 55 to 59 | 6.6% | 7.8% | 6.7% |
| Age 60 to 64 | 6.4% | 4.3% | 6.3% |
| Age 65 to 74 | 8.7% | 10.9% | 9.6% |
| Age 75 to 84 | 3.8% | 4.4% | 4.5% |
| Age 85 and over | 2.2% | 1.5% | 1.9% |
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| Race | | | |
| | Martinez, GA | Evans, GA | United States |
| White | 70.7% | 75.5% | 59.4% |
| Black | 13.5% | 9.2% | 12.2% |
| Asian | 6.4% | 5.3% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.4% | 0.5% | 0.4% |
| Two or More Races | 3.5% | 3.3% | 3.2% |
| Hispanic | 5.4% | 6.3% | 18.4% |
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| Marriage & Family | | | |
| | Martinez, GA | Evans, GA | United States |
| Married Population | 49.6% | 57.7% | 49.8% |
| Currently Married | 47.6% | 56.6% | 48.0% |
| Married but Separated | 2.0% | 1.1% | 1.8% |
| Single Population | 50.4% | 42.3% | 50.2% |
| Never Married | 30.9% | 27.0% | 33.8% |
| Divorced | 13.4% | 10.6% | 10.8% |
| Widowed | 6.1% | 4.8% | 5.6% |
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| Household Size | 2.90 | 3.44 | 2.60 |
| Households | 11,656 | 11,129 | 124,010,992 |
| Family Households | 7,908 | 8,979 | 80,755,759 |
| Married couple, w/children | 32.1% | 37.4% | 30.5% |
| Married couple, no children | 43.6% | 48.8% | 42.9% |
| Non Family Households | 3,748 | 2,150 | 43,255,233 |
| Single householder, w/children | 17.7% | 8.9% | 15.8% |
| Single householder, no children | 6.7% | 4.9% | 10.8% |