Alaska Counties by Population (2025)

There are 30 counties in Alaska.

The most populous county in the U.S. state of Alaska is Anchorage Municipality. With a population of 291,538 in 2019, Anchorage Municipality has seen a growth rate of -0.60% since the time of the 2010 census.

Following Anchorage Municipality, the next three most populous counties are:

• Matanuska-Susitna Borough: 107,610
• Fairbanks North Star Borough: 98,971
• Kenai Peninsula Borough: 58,533

These are the only boroughs with populations of more than 40,000 in Alaska. Only Anchorage Municipality experienced a population decline. The greatest increase in population happened in Matanuska-Susitna Borough, which grew 19.92% since 2010.

Alaska Counties with the Fewest Residents

The least populous county in Alaska is Yakutat City and Borough with a population of only 604 following a growth decrease of 8.76% since the 2010 U.S. census.

Other small counties include:

• Bristol Bay Borough: 877
• Skagway Municipality: 1,148
• Lake and Peninsula Borough: 1,587

All of these counties experienced a negative population growth of up to -12.48% (Bristol Bay Borough) except Skagway Municipality, which grew 18.60%.

Alaska Counties with Rapid Growth

The county with the most rapid rate of growth in Alaska is Matanuska-Susitna Borough. Matanuska-Susitna Borough has seen a growth rate of 19.92% since the 2010 U.S. census, and as of 2019 has a population of 107,610.

Other counties with rapid growth include:

• Skagway Municipality: 18.86%
• Denali Borough: 12.21%
• Kusilvak Census Area: 11.23%

These are the only counties with double-digit growth. Bristol Bay Borough has seen the largest decrease in population with a growth rate of -12.48%.