Objectives This study aimed to examine current relationships with neighbors among city dwellers and determine the factors associated with providing and accepting support in daily life.Methods The "Survey to Enrich the Lives of Miyamae Ward Residents" was conducted with 1,000 people aged ≥30 years residing in Miyamae Ward, Kawasaki City. The survey items included baseline characteristics (e.g., sex, age, and residential status), relationships with neighbors, inclination to share personal information, and inclination to provide/accept support for the instrumental activities of daily living (IADL). To identify the factors associated with providing and accepting support for IADL, logistic regression analyses were performed with the following independent variables: baseline characteristics, neighborly relationships, inclination to share personal information, and inclination to provide support for the IADL.Results We analyzed 407 respondents with complete responses. Among the different levels of neighborly relationships, 11.8% of the respondents were "cooperative with neighbors in daily life," 33.3% would "only stand and talk," 46.0% would "only exchange greetings," and 9.0% had "no relationships with neighbors." Among those willing to provide support, the highest proportions of responses were for "Calling on/watching over others" (60.1%) and "Helping to throw out garbage" (51.7%). In contrast, less than 30% of respondents were willing to seek support from neighbors and volunteers for these two activities. The factors significantly associated with a willingness to provide support were women and relationships with neighbors at the "stand and talk" level or higher. A disinclination to share personal information was inhibitory to providing support. The factors significantly associated with a willingness to accept support were women and the inclination to provide support according to IADL. Home ownership was inhibitory to accepting support.Conclusion Fixed residential status and longer residence durations did not necessarily contribute to closer relationships with neighbors in urban areas. Although the respondents generally only exchanged greetings with neighbors, closer relationships are needed to facilitate a willingness to provide support to others. While many respondents were willing to provide simple assistance in daily life, rather fewer would seek help for the same activities. However, the acceptance of support was associated with the inclination to provide support, indicating a correlation between these two attitudes. In order to further encourage mutual support in daily life in urban areas, it is necessary to not only improve the level of relationships with neighbors, but also to implement initiatives that increase opportunities for people to gain experience providing support.