Fragmented jurisdictional settings, particularly in the provision of local police services, characterize many metropolitan areas in this country. An im portant issue is whether differences in the social and economic makeup of local jurisdictions constitute barriers to the cooperation that is necessary to control urban crime. In this article, social, economic, and racial differences between suburban municipalities are examined to determine their effects on measures of cooperation between local police departments. Social distance and differences in racial mix between jurisdictions are more strongly and more consistently associated with levels of cooperation between suburban police departments than is economic distance. Greater social distance appears to enhance cooperation. The study indicates that greater differences in the proportions of nonwhite residents between suburban municipalities are linked to lower levels of cooperative agreements between police departments. Finally, the findings from this study ...