Long wavelength (>500 km) magnetic anomalies, measured by the Pogo series satellites at altitudes 400--700 km over the United States and adjacent areas are inverted to an equivalent layer magnetization model based on an equal area dipole source array at the earth's surface. Minimum source spacing giving a stable solution and a physically meaningful magnetization distribution is 300 km, but a scheme is presented for effectively sampling the distribution on a grid twice as fine. The model in effect expresses lateral variation in the vertical integral of magnetization and is a starting point for models of lateral variation in the form of the magnetization-depth curve in the magnetic crust. The magnetization model contours correlate with large-scale tectonic features and in the western part of the country probably reflect Curie isotherm undulations.