The U.S. microenterprise development field has matured considerably in recent years. However, as this guide argues, to reach scale, microlending organizations need to become more adept at conducting market research in order to retain current clients and attract new ones. The quantitative and qualitative results of market research conducted across the ACCION USA Network are presented, along with thorough explanations of market research techniques. This publication is one of the first practical guides on conducting market research for the U.S. microenterprise market made available to the public.