Rockford Bay, ID has a population of 272 and is the 22,981st largest city in the United States. The population density is 72 per sq mi which is 278% higher than the Idaho average and 20% lower than the national average. The median age in Rockford Bay is 63 which is approximately 77% higher than the Idaho average of 36. In Rockford Bay, 86% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 18% of Rockford Bay residents were born in Idaho, 80% were born out of state, 1% were born outside of the United States and 1% were foreign born.