Granby, CO has a population of 1,722 and is the 11,912th largest city in the United States. The population density is 133 per sq mi which is 166% higher than the Colorado average and 46% higher than the national average. The median age in Granby is 40 which is approximately 9% higher than the Colorado average of 36. In Granby, 61% of the population over 15 years of age are married, 85% speak English and 13% speak Spanish. 39% of Granby residents were born in Colorado, 50% were born out of state, 1% were born outside of the United States and 10% were foreign born.