This paper will explore immigrant segregation levels and identify some of its main drivers.  It will also investigate whether immigrant segregation influences immigrant poverty and other important socio-economic outcomes.  It will use data from the 2005-09 American Community Survey and a variety of techniques to measure overall immigrant segregation and segregation levels for a number of pairwise immigrant groups, particularly those from large sending regions in the world.  It also proposes to use a variety of estimating methods to examine causes of immigrant segregation, especially a novel look at the influence of historic black-white segregation (referred to as measures of segregation infrastructure) and whether this relationship is consistent across year of entry for immigrant groups.  It then will turn to addressing whether immigrant segregation influences such outcomes as poverty, and if so in what direction. Results from these exercises will shed light on whether immigrant segregation exacerbates poverty a la Wilson's model of urban poverty, or has no influence, or reduces poverty in ways consistent with the ethnic enclave model of immigrant incorporation.