Spirit Lake, ID has a population of 2,269 and is the 10,342nd largest city in the United States. The population density is 903 per sq mi which is 4634% higher than the Idaho average and 897% higher than the national average. The median age in Spirit Lake is 36 which is approximately 1% higher than the Idaho average of 36. In Spirit Lake, 62% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 31% of Spirit Lake residents were born in Idaho, 67% were born out of state, 1% were born outside of the United States and 1% were foreign born.