This article aims to analyze the role of social inequality and lack of social security as two social obstacles to sustainable development in economic development programs, examining Noorabad Delfan County. The research is applied in terms of purpose, quantitative in terms of approach, and survey in terms of method. The statistical population was the residents of Noorabad Delfan City with a reported population of 71,006 people. In the method section, the sample size is 786 people and multi-stage cluster sampling is announced; however, the number of analyzed cases is 387 people in the inferential tables and this inconsistency is explicitly reported in the article. The data were collected with a researcher-made questionnaire and analyzed with descriptive statistics, Pearson correlation coefficient, and multiple regression. The validity of the instrument was examined through face validity and expert opinion, and the total alpha of the instrument was 0.87 and the alpha of the lack of social security subscale was reported as 0.87. The average of lack of social security was 16.7804 and the average of economic development was 21.7519. The total number of responses that agreed and strongly agreed with the importance of pedestrian and vehicle traffic safety at night was 94.6%. There was a negative and significant relationship between the feeling of social inequality and economic development with a coefficient of about r=-0.149. In the regression model, the feeling of social inequality and lack of social security also showed negative and significant coefficients.