Ammon, ID has a population of 14,767 and is the 2,874th largest city in the United States. The population density is 1,962 per sq mi which is 10182% higher than the Idaho average and 2065% higher than the national average. The median age in Ammon is 31 which is approximately 13% lower than the Idaho average of 36. In Ammon, 68% of the population over 15 years of age are married, 93% speak English and 5% speak Spanish. 59% of Ammon residents were born in Idaho, 38% were born out of state, 1% were born outside of the United States and 3% were foreign born.