POPLINE^® (POPulation information onLINE) contains citations with abstracts to scientific articles, reports, books, and unpublished reports in the field of population, family planning, and related health issues. POPLINE is maintained by the K4Health Project at the Johns Hopkins Bloomberg School of Public Health/Center for Communication Programs and is funded by the United States Agency for International Development (USAID).

POPLINE has nearly 370,000 records and has been maintained since 1973 by the K4Health Project (formerly INFO Project). The majority of items are published from 1970 to the present, however, there are selected citations dating back to 1827. The database adds 8,000 records annually.

In addition to free text searching, the database can be searched by keywords from the POPLINE Thesaurus, a controlled vocabulary of 2,400+ terms used to index documents in the database.

POPLINE's special features include links to free, fulltext documents; the ability to limit your search to peer-reviewed journal articles; RSS feeds for topical searches; and many abstracts in French and Spanish.