The practices required by community and public health nurses to establish community networks mainly involve communicative competencies. Assessment through development and testing of such competencies is necessary for community and public health nurse educators and practitioners around the world to create and maintain a mutual support network. The purpose of this study was to develop and test a scale for community and public health nurse practices to establish and maintain community networks, and to then determine construct validity in a factorial structure model. The participants were 3970 community and public health nurses in Japan. A 43-item list was developed from a literature review, individual interviews, and repeated examinations. The secondary structural model consisted of four factors with 21 items. The internal consistency of the 21 items was highly reliable (Cronbach's α = 0.915). Confirmatory factor analysis by structural equation modeling showed the fit criteria to be statistically significant. Attributes of the community and public health nurses (age, years of experience, work municipalities, work positions, and educational institutions) showed significant relationships with the scale scores. The findings validated the efficacy of the Network Establishment Practices Scale to assess community and public health nurse practices to establish community networks.