The unemployment rate rose statewide in May.
Oklahoma labor leaders say the trend is not uncommon for the month.
Figures released Tuesday show Sequoyah County, in southeastern Oklahoma, had the highest unemployment rate of 9 percent.
That's up from 8.2 percent in April.
The lowest unemployment rate was in Roger Mills County, in western Oklahoma, at 2.2 percent.
Tulsa County saw a nearly one percent jump.
It's now 5.4 percent.
In the state's largest county, Oklahoma County, the rate was 5.2 percent in May, up nearly a full percentage point from 4.3 percent in April.
Oklahoma Employment Security Commission spokesman John Carpenter says it is common for the unemployment rate to spike in May as students join the search for summer employment.