Joblessness in February was lower than a year ago in all but one of Washington state’s 39 counties, according to Employment Security Department data released Tuesday.

King County’s unemployment rate was 5.2 percent last month, the same as in January but down from 5.5 percent a year ago. Pierce County’s rate was 8.3 percent in February, compared with 7.5 percent in January and 9.2 percent a year ago.

In Snohomish County, joblessness increased a tenth of a percentage point over the month to 6.0 percent. Still, that was below its year-ago rate of 6.2 percent.

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

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The only year-over-year increase was in Eastern Washington’s Whitman County, which saw unemployment rise to 6.9 percent from 6.5 percent in February 2013.

As previously reported, the statewide seasonally adjusted unemployment rate was 6.4 percent last month, the same as in January.

Amy Martinez: 206-464-2923 or On Twitter: @amyemartinez