TULSA, Oklahoma - A report shows that Oklahoma residents continue to pay some of the highest combined state and local sales taxes in the nation.

The Tax Foundation's annual report shows that Oklahoma's average combined sales-tax rate at 8.78 percent is slightly higher than last year's 8.72 percent. The state has dropped from fifth to sixth in rankings, after Alabama moved up to fourth.

The Tulsa World reports that the rankings are calculated by adding state sales taxes to an average of all local sales taxes.

But when it comes to other taxes at the state and local level, the Tax Foundation's previous assessments shows that Oklahoma ranks fairly low. The organization ranked Oklahoma 38th in total per capita state and local tax collections for 2012, the last year for which data was available.