Chehalis, originally named Saundersville after a local pioneer family, was officially incorporated in 1883 and later renamed Chehalis, derived from a Chehalis tribal word meaning "shifting sands" or "place of sand".

Situated in the Chehalis River Valley, Chehalis benefits from fertile soil and a strategic location along Interstate 5, contributing to its historical and present-day economic viability.

Chehalis experienced rapid growth in the late 19th and early 20th centuries due to its prominence as a railroad hub and agricultural center, becoming a significant transportation and trading point.

The population of Chehalis has shown steady growth over the decades, reflecting its evolving economic base and appealing quality of life, with recent trends indicating a moderate increase.

Agriculture, particularly dairy farming and berry cultivation, has historically been a cornerstone of the Chehalis economy, contributing substantially to its regional identity and commerce.

The manufacturing sector in Chehalis has diversified over time, encompassing wood products, food processing, and other industries that capitalize on local resources and transportation infrastructure.

Chehalis is home to Centralia College, a vital educational institution providing vocational training and academic programs that serve the region's workforce and intellectual community.

The Veterans Memorial Museum in Chehalis preserves and honors the contributions of veterans from all branches of the U.S. military, fostering a strong sense of patriotism and remembrance.

The Chehalis-Centralia Airport serves as an important transportation link for both general aviation and business travel, enhancing the area's connectivity and economic development.

The city's historic downtown area features well-preserved architecture from the late 19th and early 20th centuries, reflecting its rich history and providing a charming setting for local businesses.

Although Chehalis does not host any UNESCO World Heritage Sites, its proximity to the natural beauty of the Pacific Northwest makes it a gateway to exploring stunning landscapes.

The Southwest Washington Fair, held annually in Chehalis, is a major regional event attracting thousands of visitors and showcasing local agriculture, crafts, and entertainment.

While Chehalis is not directly linked to major national historical events, its development mirrors the broader patterns of westward expansion and economic growth in the Pacific Northwest.

Chehalis plays a role in Washington state politics through its representation in the state legislature and its participation in local elections, influencing policy decisions at the regional level.

The Great Flood of 2007 significantly impacted Chehalis, leading to substantial property damage and prompting the construction of flood mitigation measures to protect the city from future disasters.