This article discusses one of the most important geophysical factors, which produces an impact on the demographic processes and reflects the nature of variability in the anomalous magnetic field intensity in space. The article characterises the horizontal magnetic gradients, which vary within the wide range: from 10 to 2400 nT/km. It distinguishes magnetic scale and magnetic gradient areas. The article gives an ecodemographic evaluation of the territory of Latvia by the gradience of the anomalous magnetic field