The paper examines the impact of development of agricultural sector on performance of the cooperative banks in Poland in years 1997-2004. The levels of the agricultural development and the economic/financial situation of the banks were assessed by using country-level and regional-level aggregate indicators based on the factor analysis. The research results show that the type of region (i.e. voivodeship and macro-region) has a statistically significant impact both on the aggregate indicator of agricultural development and the aggregate indicator of banks’ performance. As for the relationship between the agricultural development level and the economic/financial situation of banks, statistically significant correlations were found only for four out of sixteen voivodeships.