This brief describes four national surveys with data relevant to subsidy-related research and provides a useful set of considerations for subsidy researchers considering use of secondary data. Specifically, this brief describes each of the four datasets reviewed, highlighting unique features of each dataset and providing information on the survey design; provides a synopsis of available variables related to the study of child care subsidies from each dataset; discusses advantages and disadvantages of the surveys; and provides recommendations for future research using these datasets. It is the authors' hope that this methodology brief will offer researchers general guidance in selecting datasets suitable for various research questions related to child care subsidies and building accurate measures of child care subsidy receipt using available data. Selected Variables in the Survey for Child Care Subsidy Research are appended. (Contains 1 table and 11 footnotes.)