Since 2013, DaSy has tracked the status of Part C and Part B 619 state data systems to understand states' technical assistance needs, provide stakeholders with a national picture of what capacities state data systems have, and to track how those capacities are changing over time. Most recently, in spring of 2021, DaSy collected comprehensive information on Part C and Part B 619 data systems using an online survey developed in coordination with the IDEA Infant and Toddler Coordinators Association for Part C programs and a parallel survey for Part B 619 programs. The Part C and Part B 619 surveys contained many of the same items. All Part C and Part B 619 coordinators received a unique link to the online survey via email. Coordinators were encouraged to consult with data managers and others who are familiar with the state's early childhood data systems to compile their state's responses. DaSy received responses to the survey from Part C program staff in 49 states (94%) and from Part B 619 program staff in 48 states (92%). The aggregated frequencies from the survey items are reported in the tables in this report. These data represent responses from state staff in the 50 U.S. states, the District of Columbia, and Puerto Rico.