This report describes relationships between major farm characteristics and co-op use and membership. Analyses were based on multivariate logit regression. Statistically significant relationships were found between farm size and farm location and co-op use but relationships varied greatly by farm type and type of use activity. No statistically significant relationship was found between co-op use and operator age. Statistically significant relationships were found between co-op membership and farm size, operator age, and farm location. These relationships varied also by farm type. Data for the study are for 1986 and were obtained from surveys by National Agricultural Statistics Service, U.S. Department of Agriculture.