The local budget represents an important planning and management instrument of the financial activity at the level of administrative-territorial units, an instrument that supports and puts into practice sustainable development policies at local level. In the present paper, we have performed a statistical analysis of the dynamics and structure of the public revenues and expenditures of the Municipality of Ploiesti between 2004 and 2008 and we wish to highlight the main aspects of the local financial policy, the progress made and the difficulties that occurred, the extent to which the budget of the Municipality of Ploiesti is or is not an efficient financial instrument from the sustainable development perspective.