County Maps US

Kennebec County, Maine

A county in Maine, ranked 4 of 16 by population.

CountyFIPS 23011

Within Maine
Kennebec County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Augusta, the county seat, located via the 2025 Census Gazetteer.

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Population
129,067
+4,335 (+3.5%) since 2020
Land area
867.5
square miles. A further 8.8% of the total area is water
Population density
149
people per square mile, computed rather than published
County seat
Augusta
Seat of county government.
Established
1799
226 years ago
Largest city
Augusta city
Population 19,155.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Kennebec County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Kennebec County, Maine from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 719 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Kennebec County ranks

Position among the 16 counties of Maine, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MaineNationally
Population129,0674th of 16512th of 3,144
Land area867.5 sq mi10th of 16945th of 3,144
Population density149 per sq mi5th of 16699th of 3,144
Median household income$69,0778th of 161,265th of 3,143

Full data for Kennebec County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population129,067Vintage 2025 Population Estimates
Population in 2020124,732Vintage 2025 Population Estimates
2020 estimates base?124,515Vintage 2025 Population Estimates
Land area867.5 sq mi2025 Gazetteer Files
Water area83.7 sq mi2025 Gazetteer Files
Total area951.2 sq mi2025 Gazetteer Files
Population density?149 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$69,077American Community Survey 2020-2024 5-Year Estimates
Median home value$238,200American Community Survey 2020-2024 5-Year Estimates
Median age43.7American Community Survey 2020-2024 5-Year Estimates
Households54,312American Community Survey 2020-2024 5-Year Estimates
Housing units63,521American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-539
1,061 births, 1,600 deaths
Net migration
+933
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 6 areas bordering Kennebec County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Somerset CountyMaine42 mi51,620
Waldo CountyMaine35 mi40,693
Androscoggin CountyMaine33 mi116,487
Lincoln CountyMaine28 mi36,595
Franklin CountyMaine22 mi30,824
Sagadahoc CountyMaine16 mi37,979

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 16 counties of Maine

Open the interactive Maine county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.