The concept of frequency reuse was a significant innovation in cellular radio networks, since it allowed for the resolution of two fundamental issues: spectrum congestion and user capacity, in particular. This approach is based on the intelligent allocation of channels as well as the reuse of such channels. The radio channels available to each cellular base station are assigned to a specific geographic area, referred to as a “Cell”, for usage by the base station. Hexagonal cells are preferred because they have a large surface area and have a radiation pattern that is quite similar to a circular one. The term "cluster" refers to the number of cells that collectively make use of the whole range of available frequencies. In this study cellular system with different cluster sizes is demonstrated using the ‘C’ programming language to demonstrate how to locate co-channel cells in a cellular system (program).