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Sales tax in Harper County, Oklahoma

By Brent Chudoba, editor Updated

There is no single sales tax rate in Harper County. It runs from 6.5% to 9.5% depending on the exact address, because cities and special districts inside the county levy their own on top of the 4.5% state rate. The 4.5% state rate applies everywhere in the county; everything above that depends on where you are standing. These rates were read from Oklahoma's own published schedule and checked on October 1, 2026.

What is the sales tax rate in Harper County?

Sales tax rate components in Harper County, Oklahoma
Oklahoma state rate4.5%
Harper County rate2%
Lowest combined rate in the county6.5%
Highest combined rate in the county9.5%

The combined figures are the lowest and highest totals anywhere in Harper County, so the rows above do not add up to them.

How much sales tax is that on a purchase in Harper County?

At 6.5%, a $100 purchase carries $6.50 in sales tax and a $1,000 purchase $65.00, at the lowest rate in the county. At the highest, 9.5%, the same purchases carry $9.50 and $95.00. That is general merchandise; Oklahoma taxes some categories, often groceries, differently, as the note below explains.

Among Oklahoma's 77 counties, Harper County's lowest rate ranks 7th highest, level with 20 other counties. See every Oklahoma county.

Sales tax in counties next to Harper County

Harper County borders 6 counties, 2 of them in another state. The lowest rate next door is 5% in Woods County, OK, which is $15.00 less on a $1,000 purchase than the lowest rate in Harper County.

Harper County and its neighbors, highest rate first
CountyCombined sales tax
Clark County, KS6.5% to 7.5%
Comanche County, KS6.5% to 8.5%
Beaver County, OK6.5% to 9.5%
Ellis County, OK6.5% to 10.5%
Harper County, OK (this county)6.5% to 9.5%
Woodward County, OK5.4% to 9.4%
Woods County, OK5% to 10%

Why the rate here is not the whole story

Oklahoma charges 4.5 percent statewide and then stacks a county rate and a city rate, and city boundaries do not follow county lines, so a single rate for the whole county does not exist. The county itself levies 2 percent countywide, and that county rate applies inside its towns as well as outside them. The floor of 6.5 percent is state plus county in the unincorporated part of the county. The ceiling of 9.5 percent is at Buffalo and at Laverne, which cut its city rate from 3.25 to 3 percent on October 1 2026, so the ceiling was 9.75 percent at Laverne before that date. Oklahoma dropped the state 4.5 percent from food and food ingredients on August 29 2024, but every local rate still applies to groceries, so the figures here are the general merchandise rates.

How do I find the exact rate for an address in Harper County?

Use Oklahoma's own address lookup. In Harper County the rate depends on the address, anywhere from 6.5% to 9.5%.

Who has to collect sales tax in Harper County?

Any seller with a physical presence in Oklahoma collects at the rate for the address of the sale; a remote seller does once it passes Oklahoma's economic nexus threshold. Oklahoma sales tax covers the statewide rules and what is exempt.

Work out your own numbers

Sources