Slum population in India is growing fast (25.1% decadal growth – Census 2011). Its health and nutrition indicators are worse than that of the non slum urban areas and comparable to that of rural India. The National Urban Health Mission (HUHM), launched in 2013, focuses on improving the health of urban slum population through a needs based, city-specific urban health care system that includes a revamped primary care system, targeted outreach, equitable access, and involvement of the community and urban local bodies (ULBs). The HUHM recognizes that lack of disaggregated data collected at local and/or city level impedes efficient planning with focus on the urban poor, and that data availability is a critical need.