These data were collected to examine the patterns of communication among police planners in the United States. The focus was on information-sharing, in which police planners and others contact other law enforcement agencies directly to gather the information they need to manage their departments. This study examined this informal network and its role in the dissemination of police research. The Police Communication Network Survey was mailed to the chief executives of 517 local departments and all 49 state police and highway patrol organizations in March 1996. The chief was asked to forward the questionnaire to the commander of the department's planning and research unit. Questions covered the agency most frequently contacted, how frequently this agency was contacted, mode of communication used most often, why this agency was contacted, and the agency most likely contacted on topics such as domestic violence, deadly force, gangs, community policing, problem-oriented policing, drug enforcement strategies, civil liability, labor relations, personnel administration, accreditation, and police traffic services. Information was also elicited on the number of times different law enforcement agencies contacted the respondent's agency in the past year, the percentage of time devoted to responding to requests for information from other agencies, and the amount of training the respondent and the staff received on the logic of social research, research design, statistics, operations research, cost-benefit analysis, evaluation research, and computing. Demographic variables include respondent's agency name, position, rank, number of years of police experience, number of years in the planning and research unit, and highest degree attained.