Walker, IA has a population of 841 and is the 16,264th largest city in the United States. The population density is 1,111 per sq mi which is 1934% higher than the Iowa average and 1126% higher than the national average. The median age in Walker is 40 which is approximately 4% higher than the Iowa average of 38. In Walker, 70% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 90% of Walker residents were born in Iowa, 9% were born out of state, 0% were born outside of the United States and 0% were foreign born.