The impact of county level population change on farm structure between 1970 and 1980 was examined for regions with varying growth rates using an analysis of variance technique. Eight States representing four regions with different growth rates were used as the study area. Counties in these States were stratified into three types on the basis of their metro-nonmetro status. Farm structure variables examined were related to aggregate farm structure, tenancy, and operator off-farm employment. Both the region (growth rate) and county type variables had significant effects on most aggregate farm structure variables. The full-owner and tenant operator variables were strongly related to the region classification variable.