Prairie County area

Prairie County, Arkansas covers 675.6 square miles: 647.5 square miles of land and 28 square miles of water. Its county seat is DeValls Bluff and Des Arc. An estimated 7,923 people lived there in 2025.

Official Census measurements · GEOID 051172026 Gazetteer · retrieved September 27, 2026
Land area647.5 mi²
Water area28 mi²
Population (2025)7,923
People per mi²12

County outline

Generalized outline of Prairie County, Arkansas
2025 Census cartographic boundary, fitted to this frame. County maps are not at a common scale. The 2026 area measurements below come from the separate Gazetteer release. Map source and limitations.

Where Prairie County is located

Prairie County highlighted on a map of all U.S. county equivalents. About the maps

Area breakdown

Land accounts for 95.8% of Prairie County’s measured area and water for 4.2%. Its combined area converts to 1,749.7 square kilometers or approximately 432,360 acres.

Green: land · blue: water

MeasurementSquare milesSquare kilometersAcres
Land647.5161,677.059414,410.2
Water28.04672.63917,949.4
Total675.5621,749.698432,359.7

How Prairie County compares

By original Census land area, Prairie County ranks #37 of 75 in Arkansas and #1458 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.

Its land area is 1 times the Arkansas county-equivalent median of 647.2 square miles. It accounts for 1.2% of the combined county land area in the state.

See the complete Arkansas ranking · What counts as a county equivalent?

Population and density of Prairie County

The Census Bureau estimates that 7,923 people lived in Prairie County on July 1, 2025. That ranks #2,653 of 3,222 county equivalents nationally and #67 of 75 in Arkansas. Since the April 1, 2020 estimates base of 8,283, the population has declined by 360 (−4.3%), compared with +3.4% for Arkansas as a whole.

With 647.5 square miles of land, that is 12 people per square mile (4.7 per km²), placing Prairie County #2,571 nationally for density and #65 in Arkansas. The median county equivalent has 47 people per square mile; the Arkansas median is 28. Put another way, there are about 52 acres of land per resident.

Estimated population, 2020–2025 · line scaled to this county’s own range
July 1202020212022202320242025
Estimate8,2478,0798,0368,0167,9637,923
Change—−168−43−20−53−40

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Prairie County

5 incorporated places lie at least partly in Prairie County. Together they are home to 4,177 people (52.7%); the other 3,746 (47.3%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Des Arc city, with 1,841 residents in the county. By land, Hazen city is the largest at 3.518 mi².

Incorporated placePopulation 2025Since 2020Land mi²
Des Arc cityCounty seat1,841−3.4%2.102
Hazen city1,374−6.5%3.518
De Valls Bluff city490−6%1.092
Fredonia (Biscoe) town294−3.9%0.955
Ulm town178+1.1%0.261

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Prairie County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Prairie County is not part of any metropolitan or micropolitan statistical area in the Office of Management and Budget’s July 2023 delineation; 1,306 other county equivalents are also outside one. These areas are built around an urban core of at least 10,000 people plus the counties tied to it by commuting, so counties outside them are generally rural.

ZIP codes

12 ZIP Code Tabulation Areas have land in Prairie County; 6 of them have most of their land inside the county, and the others mainly cover neighboring areas.

720177202472029720407204172060720647206672086721607217072176

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Prairie County

Prairie County shares a land border with 5 county equivalents. It has more land than 2 of them. The largest neighbor is White County (1,034 mi²) and the smallest is Woodruff County (586 mi²). Together with its neighbors, Prairie County forms a block of 4,638.8 mi² of land, of which it holds 14%.

Map of Prairie County and the 5 county equivalents that border it Lonoke County, Arkansas: 771.7 mi² landMonroe County, Arkansas: 607.5 mi² landWhite County, Arkansas: 1,034 mi² landArkansas County, Arkansas: 992.1 mi² landWoodruff County, Arkansas: 586 mi² land
Prairie County (dark) and its bordering county equivalents. Select a neighbor to open its profile. Drawn from the 2025 Census cartographic boundaries in an equal-area projection. How borders are determined.
Bordering county equivalentLand mi²Size vs. PrairieCompare
White County1,0341.6× largerCompare
Arkansas County992.11.5× largerCompare
Lonoke County771.71.2× largerCompare
Monroe County607.51.1× smallerCompare
Woodruff County5861.1× smallerCompare

How big is Prairie County compared with U.S. states?

Prairie County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.6 times as much. Arkansas’s county land could hold about 80 areas the size of Prairie County.

Land area: Prairie County and the closest-sized states
Prairie County647.5 mi²
Rhode Island1,033.9 mi²

Another way to picture it: the same land area would fill a square about 25.4 miles (41 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Prairie County?

Prairie County has more land than 1,764 of the other 3,221 county equivalents in the dataset.

Land area compared with the typical county equivalent
Prairie County647.5 mi²
Arkansas median647.2 mi²
National median604.5 mi²

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Prairie County at #1,508 nationally by total area, 50 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 4.2%, compared with a national county-equivalent median of 1.2% — 3 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Prairie County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Land rankCounty equivalentLand mi²Comparison
#1457Monroe County, Missouri647.6Compare
#1458Prairie County, Arkansas647.5This county
#1459Lapeer County, Michigan647.5Compare

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.

Representative coordinates

The Census internal point is 34.831116, -91.553620. It represents a location inside the geography; it is not necessarily the centroid or the address of a courthouse.

Source and precision

U.S. Census Bureau, 2026 Gazetteer Files, Counties. Original ALAND: 1,677,059,893 m²; AWATER: 72,638,195 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.

Download the official county source ZIP ↗ · Methodology

Common questions

How big is Prairie County?

Prairie County, Arkansas has 647.5 square miles (1,677.1 km²) of land and 28 square miles of water, for a total area of 675.6 square miles. It ranks #1458 of 3,222 U.S. county equivalents by land area.

Is Prairie County the largest county in Arkansas?

No. Prairie County ranks #37 of 75 in Arkansas by land area. The largest is Union County, with 1,039.1 square miles of land.

What counties border Prairie County?

Prairie County shares a land border with Lonoke County, Monroe County, White County, Arkansas County, and Woodruff County.

What is the population of Prairie County?

The Census Bureau estimates Prairie County had 7,923 residents on July 1, 2025, ranking #2,653 of 3,222 county equivalents. That is 12 people per square mile of land.

What is the county seat of Prairie County?

Prairie County has two county seats: DeValls Bluff and Des Arc.

What cities and towns are in Prairie County?

Prairie County has 5 incorporated places. The most populous are Des Arc city, Hazen city, De Valls Bluff city, Fredonia (Biscoe) town, and Ulm town; 3,746 residents live outside any incorporated place.

Is Prairie County part of a metropolitan area?

No. Prairie County is outside every metropolitan and micropolitan statistical area in the July 2023 OMB delineation.

How many ZIP codes are in Prairie County?

12 ZIP Code Tabulation Areas have land in Prairie County, and 6 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.

How does Prairie County compare with U.S. states?

It has less land than every state. Rhode Island, the smallest, has 1.6 times as much land.

How many acres of land are in Prairie County?

The land measurement converts to approximately 414,410 acres. Including water, total area is approximately 432,360 acres. One square mile equals 640 acres.

Why might another source show a different area?

Check whether it reports land or total area, its Census vintage, and its rounding. Our guide explains how to reconcile county area figures.

Can this establish a property boundary?

No. Statistical measurements and generalized maps do not establish property lines. Consult the relevant local surveying or land-records authority.

Cite this county

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