Over the last several years there has been a steadily growing interest in the availability of data that can be used to track the well-being of children, largely due to national and state Kids Count projects. This report reviews 15 federal data sources from which child indicators can be assessed and tracked over time for many states and localities. The data sources are: Current Population Surveys (CPS); Decennial Census; American Housing Survey (AHS); National Assessment of Educational Programs (NAEP); Common Core of Data (CCD); Schools and Staffing Survey (SASS); Vital Statistics System; Youth Risk Behavior Surveillance System (YRBSS); Behavioral Risk Factor Surveillance System (RFFSS); National Immunization Survey (NIS); National Health Interview Survey (NHIS); Sexually Transmitted Diseases Surveillance System (STD); Pregnancy Risk Assessment Monitoring system (RPRAMS); Uniform Crime Reports (UCR); and National Crime Victimization Survey (NCNS). The review of each data source includes the following: (1) basic description of the source; (2) listing of states and localities covered; (3) significant limitations of the data; (4) listing of child well-being indicators that are produced or can be produced; (5) major publications that report state and local child indicator data from the data source; (6) description of publicly available databases from which indicators can be assessed through original analyses; (7) listing of offices that produce custom analyses of the data; and (8) listing of contact persons for publications, data purchases, and further information. In addition, the report includes appendices which list state contacts who can provide the desired information or data well before the responsible federal agency, and a quick-reference table that summarizes the child well-being measures and geographic coverage across the 15 data sources, organized by topic area. (AA)