Maryland Counties by Population (2025)

There are 24 counties in Maryland.

Montgomery County is the largest county in the state, with a population of 1,095,149. The most recent census shows that its population has increased by 0.03% since the previous census.

A number of other Maryland counties also boast relatively large populations for their state, though not able to match the density of Montgomery County:

• Prince George's County : 976,725
• Baltimore County : 856,174

Maryland Counties with the Fewest Residents

The smallest county in Maryland is Kent County , with a population of just 19,673. This total represents a increase of 0.0% since the last census count was performed.

Other small counties include:

• Somerset County : 25,438
• Garrett County : 28,284
• Dorchester County : 33,354

Maryland Counties with Rapid Growth

Frederick County , with its sizeable population of 304,480, has shown the largest population growth, with an increase of 0.1% since the last census.

Montgomery County has also had relatively high population growth of 0.03% with 1,095,149 residents.

On the other hand, Baltimore city has had the largest decrease in population, with its 569,025 current residents totalling 0.0% less than the previous census.