Alabama Counties by Population (2025)

There are 67 counties in Alabama.

Jefferson County is the largest county in the state, with a population of 665,404. The most recent census shows that its population has decreased by 0.01% since the previous census.

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

• Madison County : 432,819
• Mobile County : 412,933

Alabama Counties with the Fewest Residents

The smallest county in Alabama is Greene County , with a population of just 6,955. This total represents a decrease of 0.1% since the last census count was performed.

Other small counties include:

• Perry County : 7,666
• Lowndes County : 9,288
• Wilcox County : 9,805

Alabama Counties with Rapid Growth

Limestone County , with its sizeable population of 123,081, has shown the largest population growth, with an increase of 0.2% since the last census.

Jefferson County has also had relatively high population growth of -0.01% with 665,404 residents.

On the other hand, Greene County has had the largest decrease in population, with its 6,955 current residents totalling 0.1% less than the previous census.