Riverside, MD has a population of 6,226 and is the 5,614th largest city in the United States. The population density is 2,673 per sq mi which is 326% higher than the Maryland average and 2851% higher than the national average. The median age in Riverside is 33 which is approximately 13% lower than the Maryland average of 38. In Riverside, 59% of the population over 15 years of age are married, 92% speak English and 5% speak Spanish. 56% of Riverside residents were born in Maryland, 33% were born out of state, 4% were born outside of the United States and 8% were foreign born.