County outline
Where Shiawassee County is located
Area breakdown
Land accounts for 98.2% of Shiawassee County’s measured area and water for 1.8%. Its combined area converts to 1,401 square kilometers or approximately 346,202 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 531.126 | 1,375.61 | 339,920.6 |
| Water | 9.815 | 25.421 | 6,281.6 |
| Total | 540.941 | 1,401.031 | 346,202.2 |
How Shiawassee County compares
By original Census land area, Shiawassee County ranks #65 of 83 in Michigan and #1974 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.935 times the Michigan county-equivalent median of 567.8 square miles. It accounts for 0.9% of the combined county land area in the state.
See the complete Michigan ranking · What counts as a county equivalent?
Population and density of Shiawassee County
The Census Bureau estimates that 67,681 people lived in Shiawassee County on July 1, 2025. That ranks #820 of 3,222 county equivalents nationally and #29 of 83 in Michigan. Since the April 1, 2020 estimates base of 68,078, the population has declined by 397 (−0.6%), compared with +0.5% for Michigan as a whole.
With 531.1 square miles of land, that is 127 people per square mile (49 per km²), placing Shiawassee County #845 nationally for density and #26 in Michigan. The median county equivalent has 47 people per square mile; the Michigan median is 62. Put another way, there are about 5 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 67,990 | 67,989 | 67,955 | 67,916 | 67,828 | 67,681 |
| Change | — | −1 | −34 | −39 | −88 | −147 |
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 Shiawassee County
Shiawassee County is divided into 22 municipalities and townships. In Michigan, county subdivisions are local governments, and together they cover all of the county’s land and residents.
The most populous is Owosso city, with 14,437 residents (21.3% of the county). The largest by land is Venice township, at 37.4 mi², or 7% of the county’s land. The county seat, Corunna city, has 3,000 residents. Among those with at least 1,000 residents in 2020, Perry city grew fastest since then (+2.7%).
| County subdivision | Population 2025 | Since 2020 | Land mi² | Share of county land |
|---|---|---|---|---|
| Owosso city | 14,437 | −1.8% | 5.248 | 1% |
| Owosso charter township | 4,786 | +0.4% | 31.7 | 6% |
| Caledonia charter township | 4,323 | −0.8% | 31.1 | 5.9% |
| Vernon township | 4,296 | +0.2% | 33.8 | 6.4% |
| Perry township | 4,167 | +0.6% | 31.5 | 5.9% |
| Woodhull township | 3,689 | +0.3% | 25.5 | 4.8% |
| Durand city | 3,457 | −1.3% | 1.953 | 0.4% |
| Burns township | 3,268 | −0.3% | 35.3 | 6.6% |
| Bennington township | 3,105 | −0.3% | 35.7 | 6.7% |
| Corunna cityCounty seat | 3,000 | −1.6% | 3.182 | 0.6% |
| Shiawassee township | 2,726 | −0.4% | 36.4 | 6.9% |
| Venice township | 2,424 | −0.1% | 37.4 | 7% |
| Perry city | 2,134 | +2.7% | 2.599 | 0.5% |
| Antrim township | 2,115 | −0.1% | 35.3 | 6.7% |
| Hazelton township | 2,032 | −1% | 37.3 | 7% |
Show the other 7 subdivisions
| Name | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Sciota township | 1,680 | −0.6% | 25.2 |
| Middlebury township | 1,528 | −0.2% | 24.6 |
| Laingsburg city | 1,402 | −1.8% | 1.587 |
| Rush township | 1,256 | −0.7% | 34.9 |
| New Haven township | 1,211 | −0.7% | 35.6 |
| Fairfield township | 645 | −0.8% | 25.1 |
| Ovid city | 0 | — | 0.032 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each subdivision inside Shiawassee County. Land: 2026 Census Gazetteer. How communities are listed.
Metropolitan area
Shiawassee County is a central county of the Owosso, MI Micropolitan Statistical Area. Shiawassee County is the area’s only county equivalent, so the micro area has the same 531.1 square miles of land. By combined land it ranks #416 of 542 micropolitan areas, and #121 by population. It belongs to the Lansing-East Lansing-Owosso, MI Combined Statistical Area.
ZIP codes
19 ZIP Code Tabulation Areas have land in Shiawassee County; 12 of them have most of their land inside the county, and the others mainly cover neighboring areas.
48414484184842948433484364844948460484764861648649488174883148840488414884848857488664886748872
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 Shiawassee County
Shiawassee County shares a land border with 6 county equivalents. Each of them has more land than Shiawassee County. The largest neighbor is Saginaw County (800.8 mi²) and the smallest is Ingham County (556.1 mi²). Together with its neighbors, Shiawassee County forms a block of 4,226 mi² of land, of which it holds 12.6%.
| Bordering county equivalent | Land mi² | Size vs. Shiawassee | Compare |
|---|---|---|---|
| Saginaw County | 800.8 | 1.5× larger | Compare |
| Genesee County | 636.9 | 1.2× larger | Compare |
| Gratiot County | 568.4 | 1.1× larger | Compare |
| Clinton County | 567.3 | 1.1× larger | Compare |
| Livingston County | 565.3 | 1.1× larger | Compare |
| Ingham County | 556.1 | about the same | Compare |
How big is Shiawassee County compared with U.S. states?
Shiawassee County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.9 times as much. Michigan’s county land could hold about 107 areas the size of Shiawassee County.
Another way to picture it: the same land area would fill a square about 23 miles (37.1 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 Shiawassee County?
Shiawassee County has more land than 1,248 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 Shiawassee County at #2,037 nationally by total area, 63 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 1.8%, compared with a national county-equivalent median of 1.2% — 0.6 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 Shiawassee County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #1973 | Sebastian County, Arkansas | 531.2 | Compare |
| #1974 | Shiawassee County, Michigan | 531.1 | This county |
| #1975 | Humphreys County, Tennessee | 530.8 | 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 42.951545, -84.146352. 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: 1,375,610,938 m²; AWATER: 25,420,647 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 Shiawassee County?
Shiawassee County, Michigan has 531.1 square miles (1,375.6 km²) of land and 9.815 square miles of water, for a total area of 540.9 square miles. It ranks #1974 of 3,222 U.S. county equivalents by land area.
Is Shiawassee County the largest county in Michigan?
No. Shiawassee County ranks #65 of 83 in Michigan by land area. The largest is Marquette County, with 1,809.1 square miles of land.
What counties border Shiawassee County?
Shiawassee County shares a land border with Genesee County, Clinton County, Saginaw County, Livingston County, Ingham County, and Gratiot County.
What is the population of Shiawassee County?
The Census Bureau estimates Shiawassee County had 67,681 residents on July 1, 2025, ranking #820 of 3,222 county equivalents. That is 127 people per square mile of land.
What is the county seat of Shiawassee County?
The county seat of Shiawassee County is Corunna.
What cities and towns are in Shiawassee County?
Shiawassee County has 22 county subdivisions (cities, towns and townships). The most populous five are Owosso city, Owosso charter township, Caledonia charter township, Vernon township, and Perry township.
Is Shiawassee County part of a metropolitan area?
Yes. It is a central county of the Owosso, MI Micropolitan Statistical Area.
How many ZIP codes are in Shiawassee County?
19 ZIP Code Tabulation Areas have land in Shiawassee County, and 12 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Shiawassee County compare with U.S. states?
It has less land than every state. Rhode Island, the smallest, has 1.9 times as much land.
How many acres of land are in Shiawassee County?
The land measurement converts to approximately 339,921 acres. Including water, total area is approximately 346,202 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.