Castle Rock is a city in Cowlitz County, Washington, set along the Cowlitz River between Interstate 5 and the forested foothills of the Cascade Range. It is the northernmost city in the county and sits 134 miles south of Seattle and 63 miles north of Portland, Oregon—a position that has made it a convenient stopping point and home base along the I-5 corridor. The city was incorporated in 1890, and its name reflects a prominent local rock formation. Castle Rock's modern identity is closely tied to Mount St. Helens, the volcano whose catastrophic 1980 eruption reshaped the region. The city promotes itself as the "Gateway to Mount St. Helens," serving visitors heading to the Mount St. Helens National Volcanic Monument and its interpretive centers. That connection, along with logging and the Cowlitz River's resources, has shaped the local economy and character. The community has a population of about 2,400 residents and a sparse suburban, small-town feel, with most residents owning their homes. The Castle Rock School District serves the city and the nearby communities of Vader and Ryderwood, anchoring local family life. Nearby Silver Lake and the Cowlitz River support fishing and boating, while the surrounding timber country offers hunting and outdoor recreation. Castle Rock suits households seeking a small Pacific Northwest town with easy interstate access to both the Seattle and Portland metros, framed by rivers, forests, and the landmark volcano to the east. Longview and Kelso, the principal cities of Cowlitz County, lie a short drive south and provide a fuller range of employment, healthcare, and retail. For residents, Castle Rock combines rural Northwestern character with the convenience of a major north-south highway.