In recent years, researchers in the social sciences have re-embraced data visualization as a tool for exploring data and communicating results. This development has focused primarily on quantitative data with continuous variables. In general, there has been little work toward establishing a standard for categorical data. This paper tackles a small, but important, compo- nent of data visualizations for categorical data: data visualization of contingency tables. The purpose of this paper is to review visualization techniques used for categorical data to deter- mine which techniques are appropriate for contingency tables by ensuring the graphics follow the standards that have been established for continuous data.