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The article presents a paper that proposes a four step strategy for locating urban population service facilities. Although developed with regard to a specific problem, dealing with a system of public day care centers, the strategy has considerable generality and is applicable to a wide variety of situations and scales. Since population service agencies typically operate under budget, manpower, and other constraints that restrict the number and size of facilities and preclude serving the entire population, particular attention is given to applying the locational strategy to that situation. This includes illustrating the procedure by examining the need for public day care service among the poor in Columbus, Ohio, and locational options for a system of public day care centers in its Model Cities area. The total costs of implementing the locational strategy described in this paper were substantial. Those related to estimating and mapping the demand or need surface for day care service, which in itself would provide valuable information for a service or planning agency, are relatively small.