Calvert, TX has a population of 1,188 and is the 14,084th largest city in the United States. The population density is 305 per sq mi which is 215% higher than the Texas average and 237% higher than the national average. The median age in Calvert is 32 which is approximately 7% lower than the Texas average of 34. In Calvert, 35% of the population over 15 years of age are married, 88% speak English and 6% speak Spanish. 79% of Calvert residents were born in Texas, 10% were born out of state, 5% were born outside of the United States and 6% were foreign born.