Kooskia, ID has a population of 691 and is the 17,557th largest city in the United States. The population density is 1,092 per sq mi which is 5625% higher than the Idaho average and 1106% higher than the national average. The median age in Kooskia is 54 which is approximately 51% higher than the Idaho average of 36. In Kooskia, 61% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 53% of Kooskia residents were born in Idaho, 46% were born out of state, 0% were born outside of the United States and 0% were foreign born.