Abstract: Cancer is second largest non-communicable disease and it has a large contribution in the total number of deaths. It is important for the public health professionals to understand the dynamics of cancer incidence for future strategies. Epidemiological Maps describe the Geographical distribution of the disease and the identification of the high risk areas. These maps are useful in resource allocation of policies and health decision making (Assuncao et al., 2001) .Therefore, this paper is attempted with the objective of understanding the distribution of breast cancer in Western Region of Tamil Nadu, using Thematic Maps. The data for the present study was collected from the records of NCRP, as well as the concerned private hospitals. The population density was calculated for each taluk and the incidences based on population density were calculated and attributed. Based on this, Using thematic maps the taluks were categorized into high incidences, moderate incidences and low incidences. All the analyses were performed using ArcGIS 9.1 (ESRI). From the observations, it is clear that the breast cancer incidence in the Western region of Tamil Nadu was found to be varying from one area to another, with high incidences in Coimbatore North and South taluks.