The assessment of the economic efficiency of selected forms of environmental-friendly farming (taking account of their area) was the purpose of the research. The study included 1487,6 thous. individual holdings. There were presented more important indicators of economic efficiency and sources of revenues of farming families. The results of the analysis proved the importance of the agricultural area for the functioning and development of sustainable forms of agriculture. The larger area, the easier is to reconcile the ecological and economic objectives. The economic effects of the area increase of the selected groups of holdings are not homogeneous. Sustainable and ecological farm stand out the best economic structure in comparison to others.