Zumiez Inc. announced that sales for the four-week period ended April 30, 2011 increased 24.8 percent to $32.0 million, compared to $25.7 million for the four-week period ended May 1, 2010. Comparable store sales increased 17.5 percent for the four-week period, versus a comparable store sales increase of 2.1 percent in the year ago period.