County Maps US

Maricopa County, Arizona

The most populous of Arizona's 15 counties.

CountyFIPS 04013

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

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Population
4,689,558
+244,533 (+5.5%) since 2020
Land area
9,202
square miles. A further 0.3% of the total area is water
Population density
510
people per square mile, computed rather than published
County seat
Phoenix
Seat of county government.
Established
1871
154 years ago
Largest city
Phoenix city
Population 1,665,481.

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 Maricopa 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 Maricopa County, Arizona 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 800 by 660 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 Maricopa County ranks

Position among the 15 counties of Arizona, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn ArizonaNationally
Population4,689,5581st of 154th of 3,144
Land area9,202 sq mi5th of 1528th of 3,144
Population density510 per sq mi1st of 15279th of 3,144
Median household income$89,3001st of 15317th of 3,143

Full data for Maricopa County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population4,689,558Vintage 2025 Population Estimates
Population in 20204,445,025Vintage 2025 Population Estimates
2020 estimates base?4,425,302Vintage 2025 Population Estimates
Land area9,202 sq mi2025 Gazetteer Files
Water area24.0 sq mi2025 Gazetteer Files
Total area9,226 sq mi2025 Gazetteer Files
Population density?510 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$89,300American Community Survey 2020-2024 5-Year Estimates
Median home value$452,800American Community Survey 2020-2024 5-Year Estimates
Median age37.6American Community Survey 2020-2024 5-Year Estimates
Households1,730,696American Community Survey 2020-2024 5-Year Estimates
Housing units1,884,334American 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
+11,904
50,787 births, 38,883 deaths
Net migration
+23,073
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 Maricopa 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
Pinal CountyArizona148 mi539,380
Yavapai CountyArizona120 mi252,552
Gila CountyArizona71 mi53,801
Pima CountyArizona66 mi1,074,685
Yuma CountyArizona60 mi224,449
La Paz CountyArizona43 mi16,711

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

Side by side

All 15 counties of Arizona

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

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