The Microregion of Frederico Westphalen (Brazilian Portuguese: Microrregião de Frederico Westphalen) was one of the Microregions of the Rio Grande do Sul state, in Brazil. It belonged to the mesoregion of the Noroeste Rio-Grandense.[1] Its population was estimated by the IBGE to be of 175,391 in 2005, divided in 27 municipalities. Its total area is 5,182.529 km². The IBGE has since discontinued the microregion system for population tracking, replacing it with the term "immediate geographic region" (Brazilian Portuguese: Região geográfica imediata).[2]