Enumeration of the public health workforce: developing a system.

Although it has been of interest to public health leaders, advocates, and policy planners for many years, decades have passed since the last organized count of public health workers. This article reports on methods used by the Columbia University School of Nursing, Center for Health Policy, to enumerate the public health workforce in 57 states and territories based on existing reports, summaries, and surveys. The complexity of public health workforce data is described and the scheme utilized to characterize the workforce using public agency categories is illustrated. The resulting "best current estimate" provokes many questions regarding future policy about a public health workforce database.