Yamhill County area

Population and density of Yamhill County

The Census Bureau estimates that 110,024 people lived in Yamhill County on July 1, 2025. That ranks #584 of 3,222 county equivalents nationally and #10 of 36 in Oregon. Since the April 1, 2020 estimates base of 107,722, the population has grown by 2,302 (+2.1%), compared with +0.9% for Oregon as a whole.

With 715.9 square miles of land, that is 154 people per square mile (59 per km²), placing Yamhill County #765 nationally for density and #5 in Oregon. The median county equivalent has 47 people per square mile; the Oregon median is 25. Put another way, there are about 4.2 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 Yamhill County

11 incorporated places lie at least partly in Yamhill County. Together they are home to 84,970 people (77.2%); the other 25,054 (22.8%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is McMinnville city, with 34,647 residents in the county. Among places with at least 1,000 residents in 2020, Lafayette city grew fastest since then (+6.3%).

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

Metropolitan area

Yamhill County is an outlying county of the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area. Its 7 county equivalents have 2,542,282 residents on 6,687.4 square miles of land; Yamhill County accounts for 10.7% of the land and 4.3% of the residents. By combined land it ranks #28 of 393 metropolitan areas, and #26 by population. It belongs to the Portland-Vancouver-Salem, OR-WA Combined Statistical Area.

ZIP codes

15 ZIP Code Tabulation Areas have land in Yamhill County; 11 of them have most of their land inside the county, and the others mainly cover neighboring areas.

971019711197114971159711997123971279712897132971409714897304973479737897396

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 Yamhill County

Yamhill County shares a land border with 5 county equivalents. Each of them has more land than Yamhill County. The largest neighbor is Clackamas County (1,870.7 mi²) and the smallest is Washington County (724.3 mi²). Together with its neighbors, Yamhill County forms a block of 6,335.9 mi² of land, of which it holds 11.3%.

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

Yamhill County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.4 times as much. Oregon’s county land could hold about 134 areas the size of Yamhill County.

Another way to picture it: the same land area would fill a square about 26.8 miles (43.1 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 Yamhill County?

Yamhill County has more land than 1,955 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 Yamhill County at #1,378 nationally by total area, 111 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% — 0.8 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 Yamhill 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.