Lake Jackson, TX has a population of 27,407 and is the 1,571st largest city in the United States. The population density is 1,389 per sq mi which is 1332% higher than the Texas average and 1433% higher than the national average. The median age in Lake Jackson is 37 which is approximately 7% higher than the Texas average of 34. In Lake Jackson, 64% of the population over 15 years of age are married, 80% speak English and 16% speak Spanish. 65% of Lake Jackson residents were born in Texas, 22% were born out of state, 1% were born outside of the United States and 11% were foreign born.