Linn County is one of the 36 counties in the U.S. state of Oregon. As of the 2023 census population estimates, the population was 131,496. The county seat is Albany. The county is named in the honor of Lewis F. Linn, a U.S. Senator from Missouri who advocated the American settlement of the Oregon Country. Linn County comprises the Albany, OR Metropolitan Statistical Area, which is included in the Portland-Vancouver-Salem, OR-WA Combined Statistical Area. It is located in the Willamette Valley.