This study highlights the uniqueness of tolerance behavior practiced among society in city of Tomohon in North Sulawesi. There is such sustainable harmonious situation supported by the tolerance behavior within the diverse ethnicity, religion, races and lingual practices. The study uses qualitative approach and grounded theory as data analysis technique to analyze the identification of several social activities in society of Tomohon city. Those tolerance behaviors are clearly captured in various activities such as market trade, community gathering, wedding and funeral ceremony, and religious celebration day. Those kinds of social activities have been successfully accommodated the interaction among the people. The implementation of local value without hesitation to external thoughts that turn into social norm also support the realization of tolerance among the local and immigrants with different religion and ethnic background.