County outline
Where Coos County is located
Area breakdown
Land accounts for 88.4% of Coos County’s measured area and water for 11.6%. Its combined area converts to 4,678.4 square kilometers or approximately 1,156,068 acres.
Green: land · blue: water
| Measurement | Square miles | Square kilometers | Acres |
|---|---|---|---|
| Land | 1,596.051 | 4,133.753 | 1,021,472.6 |
| Water | 210.305 | 544.687 | 134,595.2 |
| Total | 1,806.356 | 4,678.441 | 1,156,067.8 |
How Coos County compares
By original Census land area, Coos County ranks #23 of 36 in Oregon and #378 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.
Its land area is 0.874 times the Oregon county-equivalent median of 1,826.2 square miles. It accounts for 1.7% of the combined county land area in the state.
See the complete Oregon ranking · What counts as a county equivalent?
Population and density of Coos County
The Census Bureau estimates that 63,992 people lived in Coos County on July 1, 2025. That ranks #865 of 3,222 county equivalents nationally and #16 of 36 in Oregon. Since the April 1, 2020 estimates base of 64,926, the population has declined by 934 (−1.4%), compared with +0.9% for Oregon as a whole.
With 1,596.1 square miles of land, that is 40 people per square mile (15 per km²), placing Coos County #1,752 nationally for density and #17 in Oregon. The median county equivalent has 47 people per square mile; the Oregon median is 25. Put another way, there are about 16 acres of land per resident.
| July 1 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|
| Estimate | 64,982 | 65,166 | 65,150 | 64,578 | 64,242 | 63,992 |
| Change | — | +184 | −16 | −572 | −336 | −250 |
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 Coos County
7 incorporated places lie at least partly in Coos County. Together they are home to 37,919 people (59.3%); the other 26,073 (40.7%) live outside any incorporated place, in unincorporated communities and rural areas.
The largest is Coos Bay city, with 15,686 residents in the county. The county seat, Coquille city, has 3,943 residents.
| Incorporated place | Population 2025 | Since 2020 | Land mi² |
|---|---|---|---|
| Coos Bay city | 15,686 | −2% | 10.6 |
| North Bend city | 9,966 | −3.3% | 3.932 |
| Coquille cityCounty seat | 3,943 | −1.6% | 2.762 |
| Bandon city | 3,297 | −0.8% | 2.76 |
| Myrtle Point city | 2,462 | −0.8% | 1.607 |
| Lakeside city | 1,863 | −2.3% | 1.999 |
| Powers city | 702 | −1.5% | 0.584 |
Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Coos County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.
Metropolitan area
Coos County is a central county of the Coos Bay-North Bend, OR Micropolitan Statistical Area. Coos County is the area’s only county equivalent, so the micro area has the same 1,596.1 square miles of land. By combined land it ranks #101 of 542 micropolitan areas, and #145 by population.
ZIP codes
10 ZIP Code Tabulation Areas have land in Coos County; 8 of them have most of their land inside the county, and the others mainly cover neighboring areas.
97406974119741497420974239744997450974589745997466
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 Coos County
Coos County shares a land border with 2 county equivalents. Each of them has more land than Coos County. The largest neighbor is Douglas County (5,035.8 mi²) and the smallest is Curry County (1,628.4 mi²). Together with its neighbors, Coos County forms a block of 8,260.2 mi² of land, of which it holds 19.3%.
| Bordering county equivalent | Land mi² | Size vs. Coos | Compare |
|---|---|---|---|
| Douglas County | 5,035.8 | 3.2× larger | Compare |
| Curry County | 1,628.4 | about the same | Compare |
How big is Coos County compared with U.S. states?
Coos County has more land than 1 of the 50 states. It is about 1.5 times the land area of Rhode Island (1,033.9 mi²), while Delaware, the next larger state, has 1.2 times as much land (1,948.6 mi²). Oregon’s county land could hold about 60 areas the size of Coos County.
Another way to picture it: the same land area would fill a square about 40 miles (64.3 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 Coos County?
Coos County has more land than 2,844 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 Coos County at #367 nationally by total area, 11 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 11.6%, compared with a national county-equivalent median of 1.2% — 10.5 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 Coos County in the national ranking. They can be in different states and are not necessarily geographic neighbors.
| Land rank | County equivalent | Land mi² | Comparison |
|---|---|---|---|
| #377 | Tripp County, South Dakota | 1,612.3 | Compare |
| #378 | Coos County, Oregon | 1,596.1 | This county |
| #379 | Huerfano County, Colorado | 1,591 | 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 43.185910, -124.094133. 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: 4,133,753,721 m²; AWATER: 544,687,851 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 Coos County?
Coos County, Oregon has 1,596.1 square miles (4,133.8 km²) of land and 210.3 square miles of water, for a total area of 1,806.4 square miles. It ranks #378 of 3,222 U.S. county equivalents by land area.
Is Coos County the largest county in Oregon?
No. Coos County ranks #23 of 36 in Oregon by land area. The largest is Harney County, with 10,134.5 square miles of land.
What counties border Coos County?
Coos County shares a land border with Douglas County and Curry County.
What is the population of Coos County?
The Census Bureau estimates Coos County had 63,992 residents on July 1, 2025, ranking #865 of 3,222 county equivalents. That is 40 people per square mile of land.
What is the county seat of Coos County?
The county seat of Coos County is Coquille.
What cities and towns are in Coos County?
Coos County has 7 incorporated places. The most populous five are Coos Bay city, North Bend city, Coquille city, Bandon city, and Myrtle Point city; 26,073 residents live outside any incorporated place.
Is Coos County part of a metropolitan area?
Yes. It is a central county of the Coos Bay-North Bend, OR Micropolitan Statistical Area.
How many ZIP codes are in Coos County?
10 ZIP Code Tabulation Areas have land in Coos County, and 8 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.
How does Coos County compare with U.S. states?
It has more land than 1 of the 50 states, including Rhode Island (1,033.9 square miles of land).
How many acres of land are in Coos County?
The land measurement converts to approximately 1,021,473 acres. Including water, total area is approximately 1,156,068 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.