Joblessness in January was lower than a year ago in all of Washington state’s 39 counties, data released Tuesday from the Employment Security Department show.

King County’s unemployment rate was 5.2 percent in January, up from 4.7 percent in December but down from 5.9 percent in January 2013.

Pierce County’s rate dropped to 7.7 percent from 9.2 percent a year earlier. Still, that was up from 7.3 percent in December.

In Snohomish County, joblessness rose six-tenths of a percentage point over the month to 6.0 percent, well below its year-ago rate of 6.6 percent.

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

As reported last week, the state’s seasonally adjusted unemployment rate was 6.4 percent in January, down from 6.7 percent in December. On a non-seasonally-adjusted basis, the statewide rate was 6.9 percent in January, compared with 6.6 percent a month earlier and 8.3 percent a year earlier.

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