This bibliography offers a comprehensive list of published research on the size and characteristics of the early care and education workforce. To be included, a publication: 1) must describe features of the early care and education workforce, such as: size; demographic characteristics; wages, compensation, and benefits; experience, education, training and professional development; and retention and turnover; 2) must be intended to cover a particular geographic area, such as the nation, a region, state, county, or city; and 3) can cover the early care and education workforce as a whole, or a particular segment of it, such as Head Start, state prekindergarten, family child care, or after school. To support exploration of issues of state-level interest, this bibliography is organized by the publications' geographic scope. National and multistate studies appear first, with publications organized by the dataset analyzed in the research. Next are fifty-state studies, which include publications that present separate information on the workforce in each state. State and local studies are last, organized by state. (author abstract)