Dyer County area

Population and density of Dyer County

The Census Bureau estimates that 36,320 people lived in Dyer County on July 1, 2025. That ranks #1,319 of 3,222 county equivalents nationally and #44 of 95 in Tennessee. Since the April 1, 2020 estimates base of 36,799, the population has declined by 479 (−1.3%), compared with +5.8% for Tennessee as a whole.

With 512.4 square miles of land, that is 71 people per square mile (27 per km²), placing Dyer County #1,251 nationally for density and #52 in Tennessee. The median county equivalent has 47 people per square mile; the Tennessee median is 76. Put another way, there are about 9 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 Dyer County

3 incorporated places lie at least partly in Dyer County. Together they are home to 19,656 people (54.1%); the other 16,664 (45.9%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Dyersburg city, with 15,906 residents in the county.

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

Metropolitan area

Dyer County is a central county of the Dyersburg, TN Micropolitan Statistical Area. Dyer County is the area’s only county equivalent, so the micro area has the same 512.4 square miles of land. By combined land it ranks #425 of 542 micropolitan areas, and #379 by population.

ZIP codes

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

3800738024380303803438040380473805938070380803824038259

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 Dyer County

Dyer County shares a land border with 7 county equivalents, including 2 in Missouri and Arkansas. It has more land than 4 of them. The largest neighbor is Mississippi County (902.1 mi²) and the smallest is Lake County (165.8 mi²). Together with its neighbors, Dyer County forms a block of 3,957.9 mi² of land, of which it holds 12.9%.

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

Dyer County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2 times as much. Tennessee’s county land could hold about 80 areas the size of Dyer County.

Another way to picture it: the same land area would fill a square about 22.6 miles (36.4 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 Dyer County?

Dyer County has more land than 1,189 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 Dyer County at #2,086 nationally by total area, 53 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 2.6%, compared with a national county-equivalent median of 1.2% — 1.5 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 Dyer 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.