PIP: This article sheds light on a number of questions regarding the sociodemographic structure, economic behavior, and the process of economic insertion of unapprehended undocumented aliens in the Northern New Jersey area. The data, taken from questionnaires of the clientele of the Migration Offices of the Catholic Community Services of the Archdiocese of Newark, allows an in-depth look at the goals and motivations of the family unit and the individual while permitting a glimpse of the structural causes and consequences of international migration. Respondents hold basically secondary labor market service and light industry jobs in which they work diligently without being a burden to the community. Their diligence and effort are rewarded by a respectable showing in household income figures. They also have high participation rates both in paying income taxes and filing income tax returns. Although much of the new undocumented immigration is of relatively recent origin, the respondents plan on a long-term stay. The educational and demographic profiles indicate respondents bring with them substantial amounts of human capital which is a necessary 1st step in assessing whether their overall net contribution to the US is positive or negative.