For 2026, the sales tax rate in Whatcom County, Washington stands at 8.7% — a combination of the 6.5% state rate and 2.2% local levy. The county's 230,000 residents make it an important market in the region.
For a $500 purchase in Whatcom County, the sales tax would be $43.50, bringing the total to $543.50.
Business Compliance in Whatcom County
Businesses must register with the Washington State Department of Revenue to collect and remit sales tax. Filing frequency depends on sales volume. With a population of 230,000, Whatcom County offers significant market potential for businesses of all sizes.