Trinity, AL has a population of 2,110 and is the 10,708th largest city in the United States. The population density is 479 per sq mi which is 421% higher than the Alabama average and 429% higher than the national average. The median age in Trinity is 40 which is approximately 3% higher than the Alabama average of 39. In Trinity, 71% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 75% of Trinity residents were born in Alabama, 22% were born out of state, 2% were born outside of the United States and 1% were foreign born.