In the past, little data has been available on the characteristics of the neighborhoods selected for community improvement initiatives. This brief begins to rectify this deficiency by providing information about 133 neighborhoods in 31 metropolitan areas that have been a part of the Annie E. Casey Foundation’s Making Connections initiative and the Local Initiatives Support Corporation’s New and Sustainable Communities initiatives. These are all low-income neighborhoods, but within that broad category there is surprising variety with respect to demographic composition, poverty levels, homeownership rates, physical size, and other factors. Further research is recommended to learn more about how program strategies might best be varied to address such diverse circumstances.