Objective The aim of this study was to elucidate the status of health-care, medical, and welfare planning (hereafter, "planning")-in which public health nurses (PHNs) had participated-and the factors associated with community collaboration in the implementation phase. Additionally, suggestions regarding health activities that would contribute to improving the entire community's health level were obtained.Methods The Plan-Do-Check-Act (PDCA) cycle was the conceptual framework for this study, and the focus was the implementation phase of the plan (i.e., corresponding to the "Do" phase). Survey items were part of the "Plan" phase and identified the extent to which PHNs collaborated with community-dwellers in implementation, their demographics, their participation in the planning process, organizational factors, and the strategies used in the planning phase. The participants were full-time PHNs working in local governments who had participated in the planning process since 2013 (when the guidelines for PHNs' practices were published). A nationwide, cross-sectional survey was conducted in Japan with 2,185 PHNs from 220 regions (36 prefectures, 41 cities with public health centers, and 153 municipalities) who expressed the willingness to participate in this study. A binomial logistic regression analysis was conducted to examine the association between community collaboration and the independent variables.Results A total of 1,281 answers (a 58.6% response rate) were received. Ultimately, 1,028 (a 47.0% valid response rate) were analyzed; exclusions were 203 for no experience in health care planning since 2013 and 50 with missing values. There were 125 (12.2%) PHNs who answered that they "did not collaborate with the community-dwellers at all," 293 (28.5%) who answered that they "did not collaborate with them much," 482 (46.9%) who replied that they "collaborated with them a little," and 128 (12.4%) who responded that they "collaborated with them a lot." The binomial logistic regression analysis showed that the following were associated with PHNs' collaboration with the community: being in a managerial position, having experience developing a health promotion plan, conducting a questionnaire survey or group work, as well as participating in municipal health planning committees with community-dwellers, utilizing research evidence, identifying target groups, and managing the plan's progress.Conclusion From the planning phase, PHNs must collaborate with community residents and reflect their voices so that the formulated plan will help resolve medium to long-term issues in the community related to health and life.