This is an historical study of the volume and direction of intercensal net migration for Utah, from 1870 to 1960. Some of the demographic characteristics of net migrants are also estimated and some inferences of the impact of net migration on Utah's socio-economic development is considered. Of necessity, indirect methods of migration estimation are used. Those used are: (1) Place-of-birth method, (2) Census survival ratio method and (3) Place-of-birth census survival ratio method. The results of this study reveal, for the first time, detailed demographic characteristics as to the age, sex and origin of the net migrants for Utah from 1870 to 1960. Such knowledge can prove useful in intrepretations of Utah's history and in extrapolating future trends.