Rainbow City, AL has a population of 9,590 and is the 4,061st largest city in the United States. The population density is 377 per sq mi which is 310% higher than the Alabama average and 316% higher than the national average. The median age in Rainbow City is 40 which is approximately 4% higher than the Alabama average of 39. In Rainbow City, 62% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 74% of Rainbow City residents were born in Alabama, 22% were born out of state, 1% were born outside of the United States and 3% were foreign born.