Murphy, TX has a population of 20,015 and is the 2,177th largest city in the United States. The population density is 3,522 per sq mi which is 3533% higher than the Texas average and 3787% higher than the national average. The median age in Murphy is 37 which is approximately 8% higher than the Texas average of 34. In Murphy, 71% of the population over 15 years of age are married, 60% speak English and 5% speak Spanish. 40% of Murphy residents were born in Texas, 31% were born out of state, 1% were born outside of the United States and 27% were foreign born.