County Maps US

Phelps County, Missouri

A county in Missouri, ranked 24 of 115 by population.

CountyFIPS 29161

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

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Population
45,247
+694 (+1.6%) since 2020
Land area
671.8
square miles. A further 0.4% of the total area is water
Population density
67.4
people per square mile, computed rather than published
County seat
Rolla
Seat of county government.
Established
1857
168 years ago
Largest city
Rolla city
Population 20,588.

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 Phelps 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 Phelps County, Missouri 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 598 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 Phelps County ranks

Position among the 115 counties of Missouri, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MissouriNationally
Population45,24724th of 1151,090th of 3,144
Land area671.8 sq mi37th of 1151,404th of 3,144
Population density67.4 per sq mi27th of 1151,208th of 3,144
Median household income$58,39664th of 1152,232nd of 3,143

Full data for Phelps County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population45,247Vintage 2025 Population Estimates
Population in 202044,553Vintage 2025 Population Estimates
2020 estimates base?44,634Vintage 2025 Population Estimates
Land area671.8 sq mi2025 Gazetteer Files
Water area2.5 sq mi2025 Gazetteer Files
Total area674.3 sq mi2025 Gazetteer Files
Population density?67.4 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$58,396American Community Survey 2020-2024 5-Year Estimates
Median home value$206,500American Community Survey 2020-2024 5-Year Estimates
Median age35.8American Community Survey 2020-2024 5-Year Estimates
Households17,329American Community Survey 2020-2024 5-Year Estimates
Housing units20,295American 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
-160
390 births, 550 deaths
Net migration
+198
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 Phelps 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
Maries CountyMissouri31 mi8,397
Dent CountyMissouri29 mi14,584
Pulaski CountyMissouri28 mi54,442
Crawford CountyMissouri26 mi22,929
Texas CountyMissouri12 mi25,994
Gasconade CountyMissouri5.2 mi14,784

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

All 115 counties of Missouri

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

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