Glenns Ferry, ID has a population of 1,184 and is the 14,113th largest city in the United States. The population density is 605 per sq mi which is 3070% higher than the Idaho average and 568% higher than the national average. The median age in Glenns Ferry is 39 which is approximately 10% higher than the Idaho average of 36. In Glenns Ferry, 66% of the population over 15 years of age are married, 82% speak English and 18% speak Spanish. 53% of Glenns Ferry residents were born in Idaho, 39% were born out of state, 0% were born outside of the United States and 7% were foreign born.