T he limitation of green open space, in this case city parks, will have an effect onthe disruption of people's social activities also describes the functioning of thecity. The activities of city dwellers should be balanced with social activities incity facilities, as well as parks. The city park in Balikpapan City has undergone achange in function, due to the increase in the activity of the residents ofBalikpapan City. The green open space of Balikpapan City is currently less able toaccommodate community social activities. The purpose of this study is to identifythe social function of city parks located in Balikpapan City based on their use.The City Parks that are the location of the study are Monpera Park, Bekapai,Three Generations, Traffic and Adipura. This research uses a quantitativeapproach. Data collection is carried out primaryly through observation andquestionnaires, while secondary data collection is obtained from governmentagencies. Social functioning is measured by the variables of accessibility,recreational places, media carrying out joint activities, and education and research.Educational and research variables with visitor indicators can conduct researchrelated to plants with the lowest score of 650 (73%) and variables with passiverecreational activity indicators have the highest score of all indicators, namely 802(89%). Accessibility variables with indicators of the distance of visitorsresidences to the park have a score of 740 (82%). This result shows that the socialfunction of city parks is optimal in Balikpapan City, namely city parks are used asrecreational places. Optimal social functioning due to the support of accessibilityfactors.