Nampa, ID has a population of 87,896 and is the 374th largest city in the United States. The population density is 2,745 per sq mi which is 14285% higher than the Idaho average and 2929% higher than the national average. The median age in Nampa is 31 which is approximately 13% lower than the Idaho average of 36. In Nampa, 55% of the population over 15 years of age are married, 85% speak English and 13% speak Spanish. 49% of Nampa residents were born in Idaho, 43% were born out of state, 1% were born outside of the United States and 7% were foreign born.