Duplin County area

Population and density of Duplin County

The Census Bureau estimates that 51,571 people lived in Duplin County on July 1, 2025. That ranks #1,004 of 3,222 county equivalents nationally and #51 of 100 in North Carolina. Since the April 1, 2020 estimates base of 48,710, the population has grown by 2,861 (+5.9%), compared with +7.2% for North Carolina as a whole.

With 814.7 square miles of land, that is 63 people per square mile (24 per km²), placing Duplin County #1,346 nationally for density and #75 in North Carolina. The median county equivalent has 47 people per square mile; the North Carolina median is 116. Put another way, there are about 10 acres of land per resident.

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 Duplin County

12 incorporated places lie at least partly in Duplin County. Together they are home to 12,990 people (25.2%); the other 38,581 (74.8%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Wallace town, with 3,570 residents in the county (the city extends into 1 other county). The county seat, Kenansville town, has 814 residents. Among places with at least 1,000 residents in 2020, Wallace town grew fastest since then (+5.7%).

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

Metropolitan area

Duplin 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

19 ZIP Code Tabulation Areas have land in Duplin County; 11 of them have most of their land inside the county, and the others mainly cover neighboring areas.

28325283412834928365283932839828444284532845828464284662847828508285182852128525285722857428578

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 Duplin County

Duplin County shares a land border with 6 county equivalents. It has more land than 4 of them. The largest neighbor is Sampson County (945.9 mi²) and the smallest is Lenoir County (399.1 mi²). Together with its neighbors, Duplin County forms a block of 4,818.4 mi² of land, of which it holds 16.9%.

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

Duplin County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.3 times as much. North Carolina’s county land could hold about 60 areas the size of Duplin County.

Another way to picture it: the same land area would fill a square about 28.5 miles (45.9 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 Duplin County?

Duplin County has more land than 2,184 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 Duplin County at #1,134 nationally by total area, 96 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 0.7%, compared with a national county-equivalent median of 1.2% — 0.5 percentage points lower. 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 Duplin County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

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.