The profusion of small trades and services that characterized the nineteenth-century London labour market makes it extremely difficult to arrive at any general understanding of the work of children and juveniles. This brief study employs published statistical materials and compares children's occupations in the metropolis with the national picture. It argues that London contained exceptionally low levels of children's employment compared with the rest of England and Wales. The preoccupation of metropolitan social observers with working children may have resulted from the fact that child employment in mid-nineteenth-century London was a marginal activity associated chiefly with the very poor.