Cary, NC has a population of 155,822 and is the 164th largest city in the United States. The population density is 2,758 per sq mi which is 1423% higher than the North Carolina average and 2944% higher than the national average. The median age in Cary is 39 which is approximately 1% higher than the North Carolina average of 38. In Cary, 66% of the population over 15 years of age are married, 78% speak English and 6% speak Spanish. 30% of Cary residents were born in North Carolina, 48% were born out of state, 2% were born outside of the United States and 20% were foreign born.