Maps can provide an unprecedented level of detailed crime information. However, real estate agents, convicted sex offenders, and some police are concerned about the potential negative impacts of public access to these maps. In contrast, community activists and concerned citizens want as specific information as possible. Small and large cities, counties, and States in all parts of the country are putting their crime maps on the Web. The websites vary widely with respect to the information displayed, the timeliness of the data, and the map quality. Excellent examples of websites with crime maps are those of Vacaville, Calif., Sacramento, Calif., and Cambridge, Mass. Agencies establishing Internet crime maps should consider their goals, whether the maps will be interactive or static, and other issues. Illustration