Unemployment rates in Central Oregon counties reached historic lows in May, the Oregon Employment Department reported Tuesday.

In Deschutes County, the rate dipped to 3.8 percent, a new historical low, down from 4.2 percent in April. The county added 1,270 jobs, which was slightly more than expected for May. Most of the jobs added were in seasonal industries, including leisure/hospitality and construction.

Crook County’s unemployment rate also reached a historic low of 5.5 percent, down from 5.8 percent in April. The last time Crook County saw a similarly low rate of unemployment was in fall 2006, when it was 5.6 percent, said Damon Runberg, Central Oregon regional economist for the employment department.

Jefferson County’s unemployment rate dropped to 5.2 percent from 5.5 percent in April.