Jefferson, TX has a population of 2,416 and is the 10,026th largest city in the United States. The population density is 543 per sq mi which is 461% higher than the Texas average and 500% higher than the national average. The median age in Jefferson is 45 which is approximately 32% higher than the Texas average of 34. In Jefferson, 53% of the population over 15 years of age are married, 96% speak English and 3% speak Spanish. 79% of Jefferson residents were born in Texas, 19% were born out of state, 1% were born outside of the United States and 1% were foreign born.