Clarendon, TX has a population of 1,886 and is the 11,371st largest city in the United States. The population density is 650 per sq mi which is 570% higher than the Texas average and 617% higher than the national average. The median age in Clarendon is 34 which is approximately 1% lower than the Texas average of 34. In Clarendon, 47% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 70% of Clarendon residents were born in Texas, 28% were born out of state, 0% were born outside of the United States and 2% were foreign born.