Efficiencies of farms were measured using data envolepment analysis (DEA) on 87 dairy farms in Izmir, Turkey. Technical, allocative and economic efficiencies were 0.615, 0.673 and 0.488, respectively. Only three farms were efficient. 62% of farms had decreasing return to scale. It is concluded that the current gross production value could be preserved while decreasing the number of cows, labor (man-days) and maize silage (kg) by 50.29, 45.17 and 42.42%, respectively.