Hayden, ID has a population of 13,916 and is the 3,006th largest city in the United States. The population density is 1,339 per sq mi which is 5986% higher than the Idaho average and 1378% higher than the national average. The median age in Hayden is 41 which is approximately 14% higher than the Idaho average of 36. In Hayden, 62% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 35% of Hayden residents were born in Idaho, 62% were born out of state, 1% were born outside of the United States and 1% were foreign born.