Sponsored Listings:
Ariel Post Office
5712 Lewis River Rd
Ariel, Washington 98603
Carrolls Post Office
3803 Old Pacific Hwy S
Carrolls, Washington 98609
Castle Rock Post Office
126 Cowlitz St W
Castle Rock, Washington 98611
Cougar Post Office
16745 Lewis River Rd
Cougar, Washington 98616
Kalama Post Office
454 N 1st St
Kalama, Washington 98625
Kelso Post Office
304 Academy St
Kelso, Washington 98626
Longview Post Office
1603 Larch St
Longview, Washington 98632
Ryderwood Post Office
210 Morse St
Ryderwood, Washington 98581
Toutle Post Office
5208 Spirit Lake Hwy
Toutle, Washington 98649
Cowlitz County
There are 9 US Post Offices in Cowlitz County serving a total of 91,480 residents equating to 10,164 residents per post office. It's estimated that approximately 146,012 packages are handled across the 9 county post offices annually. Cowlitz County is a county located in the U.S. state of Washington. As of the 2010 census, its population was 102,410. The county seat is Kelso, and its largest city is Longview. The county was formed on April 21, 1854. Its name derives from the anglicized version of the Cowlitz Indian term, Cow-e-liske, meaning either \u201criver of shifting sands\u201d or \u201ccapturing the medicine spirit.\u201d Cowlitz comprises the Longview, WA Metropolitan Statistical Area, which is also included in the Portland-Vancouver-Salem, OR-WA Combined Statistical Area."