Walker Mill, MD has a population of 11,281 and is the 3,592nd largest city in the United States. The population density is 3,573 per sq mi which is 653% higher than the Maryland average and 3843% higher than the national average. The median age in Walker Mill is 38 which is approximately 2% lower than the Maryland average of 38. In Walker Mill, 34% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 23% of Walker Mill residents were born in Maryland, 69% were born out of state, 1% were born outside of the United States and 7% were foreign born.