There is one unique ZIP code in Foster, Oregon and it is 97345. Area code: 541.
1
ZIP codes
42.73
sq mi land
1.56
sq mi water
541
area code
Foster, OR ZIP code map
About Foster, OR
Foster is a small unincorporated community nestled in Linn County, Oregon, identified by the single ZIP code 97345. Situated in the scenic foothills of the Cascade Mountains along the South Santiam River corridor, Foster offers residents and visitors a peaceful, rural lifestyle surrounded by stunning natural beauty. Though modest in size, the community serves as a gateway to outdoor recreation and is anchored by the well-known Foster Reservoir, which draws visitors from across the Willamette Valley.
Location & geography
Foster, Oregon is located in the central-western portion of Linn County, positioned along U.S. Highway 20 as it winds eastward toward the Cascade Range. Nearby communities include Sweet Home, which lies just a few miles to the east, as well as Lebanon to the northwest and Albany further to the west along the valley floor. The area encompasses 42.73 square miles of land and 1.56 square miles of water, with the South Santiam River and Foster Reservoir contributing significantly to the water coverage and shaping the community's natural landscape.
Community & economy
Foster has the character of a tight-knit rural community where outdoor recreation, agriculture, and a connection to the land define everyday life. Residents enjoy proximity to Foster Lake, Sunnyside County Park, and the broader Willamette National Forest, making fishing, boating, and hiking central to the local lifestyle. The economy in and around Foster is supported by small-scale agriculture, forestry-related industries, and tourism drawn by the reservoir and surrounding natural areas.
Transportation
The primary transportation corridor through Foster is U.S. Highway 20, which connects the community westward to Lebanon and Albany and eastward into the Cascade Mountains toward Sisters and Bend. This highway is the main artery for both daily commuting and tourism traffic heading toward the recreational areas along the South Santiam River. The nearest commercial airport is the Albany Municipal Airport for small aircraft, while the Eugene Airport (EUG) in Eugene serves as the closest full-service regional airport for Foster-area residents.
History
The Foster area developed in the late 19th and early 20th centuries as settlers moved into the South Santiam River valley, drawn by fertile lands, timber resources, and access to the natural corridor through the Cascades. The construction of Foster Dam by the U.S. Army Corps of Engineers in the mid-20th century created Foster Reservoir, which transformed the local landscape and became a defining feature of the community. The dam and reservoir were built as part of a broader flood-control and water-management effort along the South Santiam River, permanently shaping the area's identity and recreational appeal.
Did you know?
One little-known fact about Foster is that Foster Reservoir, created by Foster Dam, sits alongside Green Peter Reservoir just upstream, forming a tandem dam system that is a notable feat of mid-century civil engineering in Oregon. Together, these two reservoirs represent a significant water management project that protects downstream communities in the Willamette Valley from seasonal flooding while also providing a beloved recreational destination.
