Sheldon, TX has a population of 1,417 and is the 13,032nd largest city in the United States. The population density is 566 per sq mi which is 484% higher than the Texas average and 525% higher than the national average. The median age in Sheldon is 47 which is approximately 37% higher than the Texas average of 34. In Sheldon, 48% of the population over 15 years of age are married, 32% speak English and 68% speak Spanish. 61% of Sheldon residents were born in Texas, 7% were born out of state, 0% were born outside of the United States and 33% were foreign born.