Garden City, ID has a population of 11,423 and is the 3,552nd largest city in the United States. The population density is 2,775 per sq mi which is 14445% higher than the Idaho average and 2963% higher than the national average. The median age in Garden City is 46 which is approximately 29% higher than the Idaho average of 36. In Garden City, 55% of the population over 15 years of age are married, 92% speak English and 7% speak Spanish. 46% of Garden City residents were born in Idaho, 48% were born out of state, 2% were born outside of the United States and 4% were foreign born.