The 2021 National Workforce Registry Alliance (NWRA) dataset consists of data from 14 of 17 eligible registries: Arizona; Connecticut; Miami-Dade (Florida); Illinois; Maine; Minnesota; Missouri; Montana; Nevada; New Jersey; New York; Ohio; Pennsylvania, and Wisconsin. These PER (Partners in Employment Reporting) approved registries have met quality standards in the data collection and reporting on early childhood and out of school time workforce data. The dataset represents active registry participants as of January 1, 2019 through January 1, 2021, and includes individual records from 466,115 professionals, 76% of whom were employed at the time of the draw (356,206), working across 64,237 programs/facilities. Of the 14 participating states, registry participation was required for most of the workforce in eight states: Arizona, Illinois, Maine, Montana Nevada, Ohio, Pennsylvania, and Wisconsin. (author abstract)