Ouray County area

Ouray County, Colorado covers 542.2 square miles: 540.7 square miles of land and 1.539 square miles of water. Its county seat is Ouray. An estimated 5,265 people lived there in 2025.

Official Census measurements · GEOID 080912026 Gazetteer · retrieved September 27, 2026
Land area540.7 mi²
Water area1.539 mi²
Population (2025)5,265
People per mi²9.7

County outline

Generalized outline of Ouray County, Colorado
2025 Census cartographic boundary, fitted to this frame. County maps are not at a common scale. The 2026 area measurements below come from the separate Gazetteer release. Map source and limitations.

Where Ouray County is located

Ouray County highlighted on a map of all U.S. county equivalents. About the maps

Area breakdown

Land accounts for 99.7% of Ouray County’s measured area and water for 0.3%. Its combined area converts to 1,404.3 square kilometers or approximately 347,014 acres.

Green: land · blue: water

MeasurementSquare milesSquare kilometersAcres
Land540.6711,400.331346,029.4
Water1.5393.986985
Total542.211,404.317347,014.4

How Ouray County compares

By original Census land area, Ouray County ranks #58 of 64 in Colorado and #1933 of 3,222 nationally. National rankings include the 50 states, District of Columbia, and Puerto Rico.

Its land area is 0.378 times the Colorado county-equivalent median of 1,431.5 square miles. It accounts for 0.5% of the combined county land area in the state.

See the complete Colorado ranking · What counts as a county equivalent?

Population and density of Ouray County

The Census Bureau estimates that 5,265 people lived in Ouray County on July 1, 2025. That ranks #2,877 of 3,222 county equivalents nationally and #52 of 64 in Colorado. Since the April 1, 2020 estimates base of 4,879, the population has grown by 386 (+7.9%), compared with +4.1% for Colorado as a whole.

With 540.7 square miles of land, that is 9.7 people per square mile (3.8 per km²), placing Ouray County #2,653 nationally for density and #35 in Colorado. The median county equivalent has 47 people per square mile; the Colorado median is 11. Put another way, there are about 66 acres of land per resident.

Estimated population, 2020–2025 · line scaled to this county’s own range
July 1202020212022202320242025
Estimate4,8795,0595,0955,1675,1735,265
Change—+180+36+72+6+92

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 Ouray County

2 incorporated places lie at least partly in Ouray County. Together they are home to 2,253 people (42.8%); the other 3,012 (57.2%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Ridgway town, with 1,324 residents in the county. The county seat, Ouray city, has 929 residents.

Incorporated placePopulation 2025Since 2020Land mi²
Ridgway town1,324+12.2%1.848
Ouray cityCounty seat929+3.3%0.863

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

Metropolitan area

Ouray 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

3 ZIP Code Tabulation Areas have land in Ouray County; 2 of them have most of their land inside the county, and the others mainly cover neighboring areas.

814038142781432

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 Ouray County

Ouray County shares a land border with 5 county equivalents. It has more land than 1 of them. The largest neighbor is Gunnison County (3,239.1 mi²) and the smallest is San Juan County (387.5 mi²). Together with its neighbors, Ouray County forms a block of 8,812.2 mi² of land, of which it holds 6.1%.

Map of Ouray County and the 5 county equivalents that border it Montrose County, Colorado: 2,240.9 mi² landSan Miguel County, Colorado: 1,286.7 mi² landHinsdale County, Colorado: 1,117.2 mi² landGunnison County, Colorado: 3,239.1 mi² landSan Juan County, Colorado: 387.5 mi² land
Ouray County (dark) and its bordering county equivalents. Select a neighbor to open its profile. Drawn from the 2025 Census cartographic boundaries in an equal-area projection. How borders are determined.
Bordering county equivalentLand mi²Size vs. OurayCompare
Gunnison County3,239.16× largerCompare
Montrose County2,240.94.1× largerCompare
San Miguel County1,286.72.4× largerCompare
Hinsdale County1,117.22.1× largerCompare
San Juan County387.51.4× smallerCompare

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

Ouray 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. Colorado’s county land could hold about 192 areas the size of Ouray County.

Land area: Ouray County and the closest-sized states
Ouray County540.7 mi²
Rhode Island1,033.9 mi²

Another way to picture it: the same land area would fill a square about 23.3 miles (37.4 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 Ouray County?

Ouray County has more land than 1,289 of the other 3,221 county equivalents in the dataset.

Land area compared with the typical county equivalent
Ouray County540.7 mi²
Colorado median1,431.5 mi²
National median604.5 mi²

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 Ouray County at #2,034 nationally by total area, 101 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 0.3%, compared with a national county-equivalent median of 1.2% — 0.9 percentage points lower. 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 Ouray County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Land rankCounty equivalentLand mi²Comparison
#1932Dorchester County, Maryland540.8Compare
#1933Ouray County, Colorado540.7This county
#1934Nash County, North Carolina540.4Compare

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 38.154731, -107.788480. 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: 1,400,332,580 m²; AWATER: 3,986,292 m². Rankings use ALAND; exact ties use ascending GEOID. Tables preserve Census-published square miles to three decimals, with conversions based on those values.

Download the official county source ZIP ↗ · Methodology

Common questions

How big is Ouray County?

Ouray County, Colorado has 540.7 square miles (1,400.3 km²) of land and 1.539 square miles of water, for a total area of 542.2 square miles. It ranks #1933 of 3,222 U.S. county equivalents by land area.

Is Ouray County the largest county in Colorado?

No. Ouray County ranks #58 of 64 in Colorado by land area. The largest is Las Animas County, with 4,772.9 square miles of land.

What counties border Ouray County?

Ouray County shares a land border with Montrose County, San Miguel County, Hinsdale County, Gunnison County, and San Juan County.

What is the population of Ouray County?

The Census Bureau estimates Ouray County had 5,265 residents on July 1, 2025, ranking #2,877 of 3,222 county equivalents. That is 9.7 people per square mile of land.

What is the county seat of Ouray County?

The county seat of Ouray County is Ouray.

What cities and towns are in Ouray County?

Ouray County has 2 incorporated places. The most populous are Ridgway town and Ouray city; 3,012 residents live outside any incorporated place.

Is Ouray County part of a metropolitan area?

No. Ouray County is outside every metropolitan and micropolitan statistical area in the July 2023 OMB delineation.

How many ZIP codes are in Ouray County?

3 ZIP Code Tabulation Areas have land in Ouray County, and 2 of them have most of their land inside the county. Census ZIP Code Tabulation Areas approximate USPS ZIP Code areas.

How does Ouray 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 Ouray County?

The land measurement converts to approximately 346,029 acres. Including water, total area is approximately 347,014 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.

Cite this county

Download the complete CSV or JSON dataset