County outline
Where Ottawa County is located
Area breakdown
Land accounts for 34.5% of Ottawa County’s measured area and water for 65.5%. Its combined area converts to 4,225.3 square kilometers or approximately 1,044,103 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 563.52 | 1,459.51 | 360,652.8 |
| Water | 1,067.891 | 2,765.825 | 683,450.2 |
| Total | 1,631.411 | 4,225.335 | 1,044,103 |
How Ottawa County compares
By original Census land area, Ottawa County ranks #51 of 83 in Michigan and #1828 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.992 times the Michigan county-equivalent median of 567.8 square miles. It accounts for 1% of the combined county land area in the state.
See the complete Michigan ranking · What counts as a county equivalent?
What stands out about Ottawa County?
Ottawa County has more land than 1,394 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 Ottawa County at #413 nationally by total area, 1,415 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 65.5%, compared with a national county-equivalent median of 1.2% — 64.3 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 Ottawa County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #1827 | Bon Homme County, South Dakota | 563.5 | Compare |
| #1828 | Ottawa County, Michigan | 563.5 | This county |
| #1829 | Ogemaw County, Michigan | 563.5 | 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 43.054969, -86.219349. 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: 1,459,509,492 m²; AWATER: 2,765,824,456 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 many acres of land are in Ottawa County?
The land measurement converts to approximately 360,653 acres. Including water, total area is approximately 1,044,103 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.