This data release provides access to a low-altitude, aeromagnetic survey of a part of north-central Washington. The survey is centered approximately 120 km northwest of Yakima and includes the small town of Skykomish. The Skykomish aeromagnetic survey covers a part of the central Cascade Range of Washington, the western portion of the Jurassic ophiolitic Ingalls tectonic complex, and the Cretaceous Mount Stuart batholith. These data were acquired during the summer of 2010 by Goldak Airborne Surveys working under contract to the U.S. Geological Survey. Total magnetic field values were acquired using a fixed-wing aircraft flown at a target elevation of 150 m above terrain and along flight lines and tie lines spaced 400 m and 4000 m apart, respectively. Flight lines were directed north-south, and tie lines were directed east-west. A total of 7480 line-kilometers were acquired. The details of the Skykomish aeromagnetic survey are described in the document, Pasco_Skykomish_Tech_Report.pdf available for download in this data release. (The Pasco aeromagnetic survey, Washington and Oregon, was flown by Goldak Airborne Surveys during the same summer and is available for download at www.sciencebase.gov.)