Aeromagnetic data over the Mount Hood area of Oregon are dominated by the topographic expression of highly magnetized Cenozoic volcanics. Three-dimensional magnetic modeling of the Mount Hood volcanic cone indicates that the bulk of the cone, above approximately 1650 m elevation, is composed of magnetically similar andesites. The andesites are magnetized in a normally polarized direction (I = 80.0¿, D = 28.3¿) and with a magnetization of 2.9 A/m. The chief exception to this is the possible remains of an old cone which underlies the northwest slope of the Mount Hood cone. Calculations show that this old cone is magnetized with a direction approximately opposite to the earth's present field and with a magnitude of magnetization of 3.9 A/m.