E-government initiatives have been stepping forward in governments of all levels around the world. One of the most important strategies that are being carried is that of providing citizens with a single entry point for services that involve different government entities. The Smart Cities and Service Integration project (hereafter, SmartCities) aims to establish a framework for smart city service integration that would assist in the management of large scale projects related to the integration of services across governments. By using comparative case studies of six cities (New York City, Philadelphia, Seattle, Quebec City, Mexico City, Macao, and Shanghai), the project aims to develop a theoretical framework to guide smart cities service integration. This poster summarizes some of the most important results of the interviewing process. These results correspond to the analysis of four cities in North America: Philadelphia, Quebec City, Seattle and Mexico City. The research project is funded by the Social Sciences and Humanities Research Council of Canada.