Population allocation system may be considered rational only if its level of demographic processes and structures allows ensuring high quality of the population and generation reproduction. It is possible provided accounting of impact from environmental factors in the design process. One of these is abnormal magnetic field (AMF).Multi-national scientific researches about intense impact from AMF to the nervous, reproductive, cardio-vascular systems, motor apparatus, vision and other organs evidence that intense AMF is a pathogenic factor. Intense AMF also affects demographic figures of the population. When intensity interval from (-300nT to +300nT) produces a positive effect to an organism and may be considered the optimal interval for population, then, organisms begin fell discomfort if outside this range. It may be stated within two intervals: from (-300nT to -1000nT) and from (+300nT to +1000nT), where organisms can function partially employing their inner reserves. These two intervals are the adaptive zones, after them begins the pathologies. The layout histogram of the regions in the magnetic field showed that the absolute majority of the regions towns are concentrated in the optimal interval and only 3 of 26 regions towns are located in the intensive AMF (Ogres, Rigas, Bauskas regions). Similar regularity is stated in other countries too. Demographic figures grew and decrease from time to time in the course of time. Moreover, reproduction figures decreased more in the regions with intensive AMF than in the regions with optimal AMF interval. Results of this study allow advising to locate new inhabited areas and reconstruct existing residential areas in the optimal interval and partially in the positive adaptive zone.