The purpose of this user guide is to instruct developers and researchers on how to use the Census Data Application Programming Interface (API) to request data from U.S. Census Bureau datasets.
Determine the dataset that holds the information for which you are searching. Then decide what information you want from this dataset. The Census Bureau has already made available many datasets and is adding more almost monthly for querying with the API tool. Currently, the most popular aggregate datasets to query for variables using the API are as follows:
You can find a complete list of available datasets in the API Discovery Tool.