Lincoln, AL has a population of 6,429 and is the 5,507th largest city in the United States. The population density is 256 per sq mi which is 178% higher than the Alabama average and 183% higher than the national average. The median age in Lincoln is 45 which is approximately 16% higher than the Alabama average of 39. In Lincoln, 63% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 75% of Lincoln residents were born in Alabama, 23% were born out of state, 1% were born outside of the United States and 1% were foreign born.