Sanborn, IA has a population of 1,405 and is the 13,081st largest city in the United States. The population density is 741 per sq mi which is 1256% higher than the Iowa average and 717% higher than the national average. The median age in Sanborn is 44 which is approximately 16% higher than the Iowa average of 38. In Sanborn, 73% of the population over 15 years of age are married, 97% speak English and 3% speak Spanish. 77% of Sanborn residents were born in Iowa, 22% were born out of state, 1% were born outside of the United States and 1% were foreign born.