Martinez, GA has a population of 35,476 and is the 1,190th largest city in the United States. The population density is 2,445 per sq mi which is 1208% higher than the Georgia average and 2599% higher than the national average. The median age in Martinez is 40 which is approximately 9% higher than the Georgia average of 36. In Martinez, 59% of the population over 15 years of age are married, 90% speak English and 3% speak Spanish. 49% of Martinez residents were born in Georgia, 40% were born out of state, 2% were born outside of the United States and 8% were foreign born.