unincorporated community
An unincorporated area is a region that is not governed by a local municipal corporation. Widespread unincorporated communities and areas are a distinguishing feature of the United States and Canada. Most other countries of the world either have ...
and
census-designated place
A census-designated place (CDP) is a Place (United States Census Bureau), concentration of population defined by the United States Census Bureau for statistical purposes only.
CDPs have been used in each decennial census since 1980 as the count ...
Oregon
Oregon () is a state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho. T ...
, United States, approximately directly east of Astoria. Knappa faces the Columbia River, where several islands comprise the
Lewis and Clark National Wildlife Refuge
Lewis and Clark National Wildlife Refuge, near the mouth of the Columbia River, provides wintering and resting areas for an estimated 1,000 tundra swans, 5,000 geese, and 30,000 ducks. Other species include shorebirds and bald eagles.
Estuary wa ...
.
The community is named after Aaron Knapp Jr., an early settler. There was a post office in Knappa from 1872 to 1943.
Logging and fishing are the primary economic activities in Knappa. Knappa School District comprises Hilda Lahti Elementary School and Knappa High School.