Plano, TX has a population of 271,166 and is the 70th largest city in the United States. The population density is 3,784 per sq mi which is 3829% higher than the Texas average and 4076% higher than the national average. The median age in Plano is 38 which is approximately 12% higher than the Texas average of 34. In Plano, 62% of the population over 15 years of age are married, 68% speak English and 12% speak Spanish. 42% of Plano residents were born in Texas, 33% were born out of state, 1% were born outside of the United States and 24% were foreign born.