County outline
Where Prairie County is located
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
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 647.516 | 1,677.059 | 414,410.2 |
| Water | 28.046 | 72.639 | 17,949.4 |
| Total | 675.562 | 1,749.698 | 432,359.7 |
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.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 8,247 | 8,079 | 8,036 | 8,016 | 7,963 | 7,923 |
| 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 place | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Des Arc cityCounty seat | 1,841 | −3.4% | 2.102 |
| Hazen city | 1,374 | −6.5% | 3.518 |
| De Valls Bluff city | 490 | −6% | 1.092 |
| Fredonia (Biscoe) town | 294 | −3.9% | 0.955 |
| Ulm town | 178 | +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%.
| Bordering county equivalent | Land mi² | Size vs. Prairie | Compare |
|---|---|---|---|
| White County | 1,034 | 1.6× larger | Compare |
| Arkansas County | 992.1 | 1.5× larger | Compare |
| Lonoke County | 771.7 | 1.2× larger | Compare |
| Monroe County | 607.5 | 1.1× smaller | Compare |
| Woodruff County | 586 | 1.1× smaller | Compare |
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.
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.
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 rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #1457 | Monroe County, Missouri | 647.6 | Compare |
| #1458 | Prairie County, Arkansas | 647.5 | This county |
| #1459 | Lapeer County, Michigan | 647.5 | Compare |
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.
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.