Bon Homme County area

Population and density of Bon Homme County

The Census Bureau estimates that 7,244 people lived in Bon Homme County on July 1, 2025. That ranks #2,717 of 3,222 county equivalents nationally and #26 of 66 in South Dakota. Since the April 1, 2020 estimates base of 7,002, the population has grown by 242 (+3.5%), compared with +5.5% for South Dakota as a whole.

With 563.5 square miles of land, that is 13 people per square mile (5 per km²), placing Bon Homme County #2,546 nationally for density and #17 in South Dakota. The median county equivalent has 47 people per square mile; the South Dakota median is 5.7. Put another way, there are about 50 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 Bon Homme County

5 incorporated places lie at least partly in Bon Homme County. Together they are home to 4,883 people (67.4%); the other 2,361 (32.6%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Springfield city, with 1,926 residents in the county. The county seat, Tyndall city, has 1,117 residents. By land, Tyndall city is the largest at 1.578 mi². Among places with at least 1,000 residents in 2020, Tyndall city grew fastest since then (+5.8%).

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

Metropolitan area

Bon Homme 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

7 ZIP Code Tabulation Areas have land in Bon Homme County; 5 of them have most of their land inside the county, and the others mainly cover neighboring areas.

57040570595706257063570665731557376

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 Bon Homme County

Bon Homme County shares a land border with 4 county equivalents, including 1 in Nebraska. It has more land than 1 of them. The largest neighbor is Knox County (1,108.2 mi²) and the smallest is Yankton County (521.2 mi²). Together with its neighbors, Bon Homme County forms a block of 4,103.1 mi² of land, of which it holds 13.7%.

How big is Bon Homme County compared with U.S. states?

Bon Homme County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.8 times as much. South Dakota’s county land could hold about 135 areas the size of Bon Homme County.

Another way to picture it: the same land area would fill a square about 23.7 miles (38.2 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 Bon Homme County?

Bon Homme County has more land than 1,395 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 Bon Homme County at #1,823 nationally by total area, 4 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.

Its water share is 3.1%, compared with a national county-equivalent median of 1.2% — 1.9 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 Bon Homme 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.