Small and Medium-sized Enterprises (SMEs) are the main player in developing and strengthening zonal integration. This study used a sample of 1933 firms located within 5 East African countries with economic integration known as East Africa Community (EAC). Data was extracted from World Bank Business Enterprises Survey to evaluate determinants of financing obstacles of firms. Analysis of data was conducted by running ordered probit model and multivariate regression model to determine which firms’ industry or country’s characteristics explain and experienced financial constraints in their operations. The study found out that financing constraints in East African firms broadly based across firms but SMEs are mostly affected.