The study examined the effects of extension service delivery on improved potato production in Northern Zone of Plateau State, Nigeria. Four thousand five hundred registered farmers were purposively selected from three local government areas (BarkinLadi, Jos South and Riyom) as sample frame. The procedure of sample based on proportion was adopted, and 4% of the total registered farmers were taken as sample size from each local government area which gave a total number of 180. The results revealed that 52.2% of the farmers were males while 47.8 were females, The Mean age of the farmers was 43.7. Also, 81.7% were married, and 40.6% had Mean farming experience of 20.45 years. The Mean farm size of the farmers cultivated in 2018 farming season was 0.90ha, while 66.1% of them had mean annual income of ?512,313.22 in 2018. Also, the results showed that Radio, Television, Farm size and Income of the farmers had effects on potato yield at P<0.01 level of significance, while Number of contacts by extension workers was significant at P<0.05. The effective methods of communication between farmers and extension agents were home visit, farm visit and group meeting.

Keywords: Potato; Agricultural Extension; farmers’ productivity; Plateau state