This tool is a web application that shows the amount of "heterogeneity" of tuberculosis incidence for different high-risk populations. "Heterogeneity" or diversity is the difference in the level of TB in a high-risk group (for example, people born outside the United States), from one U.S. state to the next. Users can select a high-risk group of interest, and then select a specific U.S. state to serve as the "benchmark" state. TB rates for all other states will then be compared to that state. Results are shown in graphs and based on inputs from the user. The graphs update automatically. The charts shown in this tool are based on calculations from reported TB incidence data in the United States. They can be used to better understand the differences in TB rates, comparing each state to the next. This tool can: Illustrate the magnitude of between-state differences in TB incidence among key populations; Highlight the successes of certain surveillance programs on comorbid conditions (for example, states with high TB incidence in a given population may produce better estimates of that population); and Provide insights into key population groups in each state that may require extra effort in TB control (for example, states with high TB incidence in a given population may want to focus more effort on that population) For further details see the paper, State-level heterogeneity of risk factors associated with tuberculosis (TB) in the United States.; S.T. Cherng, S. Shrestha, S. Reynolds, A.N. Hill, S.M. Marks, J. Kelly, D.W. Dowdy. American Journal of Public Health: 108(S4), pp. S311S314. The findings and conclusions described in this web application and linked journal article are those of the author(s) and do not necessarily represent the views of the U.S. Centers for Disease Control and Prevention. This web tool was funded by the CDC, National Center for HIV, Viral Hepatitis, STD, and TB Prevention Epidemiologic and Economic Modeling Agreement (NEEMA, # 5 NU38PS004646-05-00)