Plano, TX has a population of 279,088 and is the 70th largest city in the United States. The population density is 3,894 per sq mi which is 3917% higher than the Texas average and 4198% higher than the national average. The median age in Plano is 39 which is approximately 13% 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. 40% of Plano residents were born in Texas, 34% were born out of state, 1% were born outside of the United States and 25% were foreign born.