Joblessness in all 39 counties in Washington state declined from March to April, with King County’s unemployment rate reaching a low not seen since April 2008.

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Joblessness in all 39 counties in Washington state declined from March to April, with King County’s unemployment rate reaching a low not seen since April 2008, data released Tuesday by the state Employment Security Department show.

King County’s unemployment rate in April was 3.3 percent, compared with 4 percent in March and 4.1 percent in April 2014.

Snohomish County’s jobless rate was 3.6 percent, down from 4.4 percent in March and 4.7 percent in the year-ago period.

Pierce County’s unemployment rate was 6.2 percent in April, compared with 6.5 percent in March and 6.9 percent in April 2014.

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Year over year, 38 counties showed a decline in joblessness, with only Lincoln County, east of Spokane, seeing a small rise, from 5.4 percent in April 2014 to 5.5 percent this April.

The county unemployment data are not seasonally adjusted for month-to-month fluctuations and are based on a household survey.

That seasonal cycle explains a large part of the dip in unemployment last month.

The highest unemployment rates, not seasonally adjusted, usually occur in January and February because of holiday-hiring layoffs, said Anneliese Vance-Sherman, a regional economist with the Employment Security Department.

Then, “we always see the unemployment rate decline from March to April,” as hiring picks up in the spring, Vance-Sherman said.

The unemployment rate will most likely rise again starting in May, as high-school and college graduates enter the job market.

The year-over-year unemployment-rate drop is part of a consistent decline since 2010.

As previously reported, the statewide seasonally adjusted unemployment rate in April fell to 5.5 percent, the lowest since July 2008. That was down from 5.9 percent in March and 6.2 percent in April 2014.

The statewide, non-seasonally adjusted unemployment rate, for direct comparison with the county data, was 5 percent in April.