Using a representative survey on a municipality in Mexico City, the article explores the relevance of both social networks and place attachments for US migration. By comparing households with and without migrants, the logistic regression models show that social networks make emigration more selective with respect “education”, but less selective regarding “sex” and “marital status”. These results shed new light on the mechanism through which social networks operate in urban settings. Even if a municipality that is very homogeneous in terms of poverty and employment opportunities, variations on the socio-demographic profile of the would-be emigrants to the USA are found depending on the household′s social networks. As for territorial variables, the general impression is one of placelessness, apart from attachment to the municipality, but here again social networks act as an intervening variable.