Jefferson, MD has a population of 2,112 and is the 10,700th largest city in the United States. The population density is 1,007 per sq mi which is 112% higher than the Maryland average and 1011% higher than the national average. The median age in Jefferson is 45 which is approximately 18% higher than the Maryland average of 38. In Jefferson, 68% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 52% of Jefferson residents were born in Maryland, 38% were born out of state, 1% were born outside of the United States and 10% were foreign born.