Pocatello, ID has a population of 54,592 and is the 735th largest city in the United States. The population density is 1,676 per sq mi which is 8683% higher than the Idaho average and 1750% higher than the national average. The median age in Pocatello is 31 which is approximately 12% lower than the Idaho average of 36. In Pocatello, 53% of the population over 15 years of age are married, 91% speak English and 4% speak Spanish. 60% of Pocatello residents were born in Idaho, 35% were born out of state, 1% were born outside of the United States and 5% were foreign born.