Roberts, ID has a population of 552 and is the 18,962nd largest city in the United States. The population density is 1,810 per sq mi which is 9387% higher than the Idaho average and 1898% higher than the national average. The median age in Roberts is 30 which is approximately 15% lower than the Idaho average of 36. In Roberts, 43% of the population over 15 years of age are married, 45% speak English and 55% speak Spanish. 52% of Roberts residents were born in Idaho, 19% were born out of state, 4% were born outside of the United States and 24% were foreign born.