In this study, different goat farms in Isparta province, which have considerable importance in goat farming in Turkey, were compared in terms of performance, production cost and profitability and the most profitable farm size was determined. Data were obtained by conducting a questionnaire with 92 goat farms selected by stratified random sampling method. Goat farms were divided into three groups according to their size and were then analysed. Accordingly farms were assigned as Group I (1-100 goats, 34 farms), Group II (101-300 goats, 26 farms) and Group III (>300 goats, 17 farms). It was found that small farms had higher lactation milk yield (kg/goat) and concentrate consumption (P < 0.05). It was also found that farms with higher capacity were advantageous in terms of economic criteria (P < 0.05). Results showed that as farm size increased, production cost per animal unit decreased (P < 0.05) and net profit per animal unit tended to increase (P > 0.05).