West Branch, IA has a population of 2,581 and is the 9,649th largest city in the United States. The population density is 809 per sq mi which is 1381% higher than the Iowa average and 793% higher than the national average. The median age in West Branch is 39 which is approximately 3% higher than the Iowa average of 38. In West Branch, 61% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 71% of West Branch residents were born in Iowa, 28% were born out of state, 0% were born outside of the United States and 1% were foreign born.