Agriculture in sub-Saharan Africa is undergoing rapid transformation involving major changes in farmland ownership and farm scales from small to medium farms, with the widespread use of mechanisation and agro-inputs. Generally, households are increasing their farm sizes while others are dropping out of agriculture as the non-farm economy grows in both rural and urban areas. This study examined the changes in farmland sizes in two districts in the north of Ghana where agricultural extensification is still possible. Specifically, the study addressed the questions of the historical agrarian context; the magnitude and character of farm structure changes; the emerging spatial manifestation of farms; and the use of factors of production among the emerging socially differentiated farmers.