Rio Grande do Sul has two Urban Agglomerations established by law.
Aglomeração Urbana do Sul (Sul Urban Agglomeration) – was the first agglomeration established in 1990. Initially it was formed by Pelotas and Capão do Leão, and in December 2003, the municipalities of Arroio do Padre, Rio Grande and São José do Norte were also included. In 2010, Sul Urban Agglomeration had a population of 578,034 inhabitants and density of 208.3 inhabitants/km².
Aglomeração Urbana do Litoral Norte (Litoral Norte Urban Agglomeration) – established in 2004, it is formed by the municipalities of Arroio do Sal, Balneário Pinhal, Capão da Canoa, Capivari do Sul, Caraá, Cidreira, Dom Pedro de Alcântara, Imbé, Itati, Mampituba, Maquiné, Morrinhos do Sul, Osório, Palmares do Sul, Terra de Areia, Torres, Tramandaí, Três Cachoeiras, Três Forquilhas and Xangri-lá. In the last decade, the region showed a high degree of urbanization and demographic growth. In 2010, Litoral Norte Urban Agglomeration had a population of 283,959 inhabitants, density of 39.6 inhabitants/km² and growth rate of 2.05% p.a.
Source: IBGE, Censo Demográfico 2010