Butler County’s unemployment rate was lower in August than all six other counties in the Pittsburgh area, according to new figures released Tuesday.

In Butler County, the August unemployment rate remained at 3.7 percent, the Pennsylvania Department of Labor and Industry’s Center for Workforce Information and Analysis reports. The rate was unchanged from July.

Meanwhile, the only county with the same unemployment rate in July, Allegheny County, inched up to 3.8 percent in August, according to the new figures.

The center groups counties together based on region. The Pittsburgh region includes Butler, Allegheny, Armstrong, Beaver, Fayette, Washington and Westmoreland counties.

Fayette County had the highest unemployment rate in August at 5.6 percent.

Butler County had 97,100 people in its labor force in August, of which 3,600 were unemployed, according to the center’s estimates.

Sandra Hoffman, an analyst for the center, said the particulars of why Butler County might be performing better than other counties in the area is a deeper subject than they can speculate on, but that August’s numbers shouldn’t surprise anyone.

“It’s nothing new,” Hoffman said. “Butler County has been among the counties with the lowest rates for the last 20 to 30 years. Even during the recession years it was among the lowest.”

Centre and Chester counties had the lowest unemployment rate in the state at 2.9 percent, while Forest County had the highest at 5.9 percent.

Of the state’s 18 regions, Pittsburgh’s was the eighth lowest.