The purposes of this study were to costs and fees of solid waste management and to provide resolutions towards solid waste management of Omnoi City Municipality. The data were collected by using financial data during 5 years from 2008 to 2012. Then the data were calculated to figure out the costs of solid waste management divided by solid waste management-related cost and non-solid waste management-related cost. The results found that annual solid waste generation rate of Omnoi City Municipality was 0.53 ton/person or 0.65 ton/household. The annual average quantity of solid waste was 27327.26 ton/year and the annual cost of solid waste management was 2084.62 Baht/ton. The costs were separated into the solid waste management-related cost including the cost of main department responsible for solid waste collection service as follows; 1) direct labor 493.79 Baht/ton 2) direct materials 170.83 Baht/ton 3) production cost 231.07 Baht/ton and 4) cost of solid waste management 477.95 Baht/ton. Moreover the non-solid waste management-related cost or the cost allocation supported by other departments consisted of Administration Department and Council 95.78 Baht/ton Office of the Municipal Clerk 308.43 Baht/ton Division of Technical Services and Planning 93.49 Baht/ton Division of Finance 137.25 Baht/ton and Division of Sanitation and Environment 76.03 Baht/ton. Omnoi City Municipality could gather the fees of solid waste management about 152.32 Baht/person/year or 186.61 Baht/household or 290.31 Baht/ton or 13.93 percent of the cost of solid waste management. According to the cost calculation of solid waste management the supporting departments associated with the solid waste management should allocate sufficient budget and provide the cost data which would be useful for administrators at all levels to measure and improve performance. Furthermore additional policies related to the solid waste management should be defined to reduce the management cost and quantity of solid waste. The responsible departments should also promote people’s understanding and realization of duty to pay for fees of solid waste management.