Sauk County area

Population and density of Sauk County

The Census Bureau estimates that 66,652 people lived in Sauk County on July 1, 2025. That ranks #833 of 3,222 county equivalents nationally and #25 of 72 in Wisconsin. Since the April 1, 2020 estimates base of 65,774, the population has grown by 878 (+1.3%), compared with +1.3% for Wisconsin as a whole.

With 831.6 square miles of land, that is 80 people per square mile (31 per km²), placing Sauk County #1,156 nationally for density and #25 in Wisconsin. The median county equivalent has 47 people per square mile; the Wisconsin median is 51. Put another way, there are about 8 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 Sauk County

Sauk County is divided into 39 cities and towns. In Wisconsin, county subdivisions are local governments, and together they cover all of the county’s land and residents.

The most populous is Baraboo city, with 13,224 residents (19.8% of the county). The largest by land is Troy town, at 52.9 mi², or 6.4% of the county’s land. Among those with at least 1,000 residents in 2020, Reedsburg city grew fastest since then (+6%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Sauk County. Land: 2026 Census Gazetteer. How communities are listed.

Metropolitan area

Sauk County is a central county of the Baraboo, WI Micropolitan Statistical Area. Sauk County is the area’s only county equivalent, so the micro area has the same 831.6 square miles of land. By combined land it ranks #247 of 542 micropolitan areas, and #128 by population. It belongs to the Madison-Janesville-Beloit, WI Combined Statistical Area.

ZIP codes

19 ZIP Code Tabulation Areas have land in Sauk County; 14 of them have most of their land inside the county, and the others mainly cover neighboring areas.

53556535615357753578535835358853913539245393753940539415394253943539445395153959539615396553968

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 Sauk County

Sauk County shares a land border with 6 county equivalents. It has more land than 5 of them. The largest neighbor is Dane County (1,196.5 mi²) and the smallest is Richland County (586.2 mi²). Together with its neighbors, Sauk County forms a block of 5,701.2 mi² of land, of which it holds 14.6%.

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

Sauk County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.2 times as much. Wisconsin’s county land could hold about 65 areas the size of Sauk County.

Another way to picture it: the same land area would fill a square about 28.8 miles (46.4 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 Sauk County?

Sauk County has more land than 2,210 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 Sauk County at #1,088 nationally by total area, 76 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 2.1%, compared with a national county-equivalent median of 1.2% — 0.9 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 Sauk 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.