Understanding the supply, distribution, and educational pipeline of nurses is key to designing programs and policies that will ensure access to care and an effective health care system. This book analyzes data from a variety of sources to present recent trends and the current status of the registered nurse (RN) and licensed practical nurse (LPN) workforces. This book also provides additional information on data and methodology for analysis of the nurse supply, including information on the calculation of standard errors, tests of significance for change over time, and use of the data for rural-urban analysis.