Eldridge, IA has a population of 6,122 and is the 5,681st largest city in the United States. The population density is 641 per sq mi which is 1073% higher than the Iowa average and 608% higher than the national average. The median age in Eldridge is 35 which is approximately 8% lower than the Iowa average of 38. In Eldridge, 64% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 67% of Eldridge residents were born in Iowa, 31% were born out of state, 0% were born outside of the United States and 1% were foreign born.