Sales tax in Grant County, Washington
There is no single sales tax rate in Grant County. It runs from 8.2% to 8.5% depending on the exact address, because cities and special districts inside the county levy their own on top of the 6.5% state rate. The 6.5% state rate applies everywhere in the county; everything above that depends on where you are standing. These rates were read from Washington's own published schedule and checked on September 9, 2026. The rate in each of the 14 cities is in the table below.
What is the sales tax rate in Grant County?
| Washington state rate | 6.5% |
|---|---|
| Lowest combined rate in the county | 8.2% |
| Highest combined rate in the county | 8.5% |
The combined figures are the lowest and highest totals anywhere in Grant County, so the rows above do not add up to them.
What is the sales tax rate in each city in Grant County?
Washington publishes the rate for every city it taxes. These are the combined rates, state and local together, as listed in Washington's own rate file.
| City | October 1 to December 31, 2026 |
|---|---|
| Coulee City | 8.2% |
| Electric City | 8.2% |
| Ephrata | 8.4% |
| George | 8.4% |
| Grand Coulee | 8.4% |
| Hartline | 8.2% |
| Krupp | 8.2% |
| Mattawa | 8.3% |
| Moses Lake | 8.5% |
| Quincy | 8.2% |
| Royal City | 8.2% |
| Soap Lake | 8.4% |
| Warden | 8.2% |
| Wilson Creek | 8.2% |
| Unincorporated Grant County | 8.2% |
Source: Washington rate file for October 1 to December 31, 2026, from Washington's official rate page.
How much sales tax is that on a purchase in Grant County?
At 8.2%, a $100 purchase carries $8.20 in sales tax and a $1,000 purchase $82.00, at the lowest rate in the county. At the highest, 8.5%, the same purchases carry $8.50 and $85.00. That is general merchandise; Washington taxes some categories, often groceries, differently, as the note below explains.
Among Washington's 39 counties, Grant County's lowest rate ranks 16th highest, level with 4 other counties. See every Washington county.
Sales tax in counties next to Grant County
Grant County borders 8 counties. The lowest rate next door is 7.9% in Douglas County, WA, which is $3.00 less on a $1,000 purchase than the lowest rate in Grant County.
| County | Combined sales tax |
|---|---|
| Kittitas County, WA | 8.3% to 8.6% |
| Yakima County, WA | 8.2% to 8.6% |
| Grant County, WA (this county) | 8.2% to 8.5% |
| Benton County, WA | 8.1% to 8.8% |
| Franklin County, WA | 8.1% to 8.9% |
| Adams County, WA | 8% to 8.2% |
| Lincoln County, WA | 8% |
| Okanogan County, WA | 8% to 8.7% |
| Douglas County, WA | 7.9% to 8.8% |
Why the rate here is not the whole story
Washington charges 6.5 percent statewide and then cities, counties, transit authorities and other special purpose districts add local rates whose boundaries do not follow county lines, so a single rate for the whole county does not exist. The Department of Revenue publishes one combined local rate for each location code and does not split out the county's own share of it, so the county rate is recorded as unknown here rather than estimated. Washington counties do levy taxes of their own that apply countywide. The floor of 8.2 percent applies in the unincorporated county and in Coulee City, Electric City, Hartline, Krupp, and four other cities. The ceiling of 8.5 percent is in Moses Lake.
How do I find the exact rate for an address in Grant County?
Use Washington's own address lookup. In Grant County the rate depends on the address, anywhere from 8.2% to 8.5%.
Who has to collect sales tax in Grant County?
Any seller with a physical presence in Washington collects at the rate for the address of the sale; a remote seller does once it passes Washington's economic nexus threshold. Washington sales tax covers the statewide rules and what is exempt.
Work out your own numbers
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Sales tax calculator
Tax on a specific purchase at this county's rate, and the total you will actually pay.
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Do you have to collect?
Whether your sales into Washington cross its economic nexus threshold. A different question from the rate.
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Property tax in Grant County
The other local tax: effective rate and median bill for this county.
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Sales tax by county
Every US county, and how Washington compares with the rest of the country.
Sources
- Grant County rates: Washington Department of Revenue, Local Sales and Use Tax Rates by City/County, Q326_Excel_LSU-rates-alpha.xlsx, edition effective July 1 2026 through September 30 2026, https://dor.wa.gov/sites/default/files/2026-05/Q326_Excel_LSU-rates-alpha.xlsx
- Collected and verified September 9, 2026. Confidence: P on the rate components, P on the range (P read on a primary agency page, S strong but indirect, U unverified).