AbstractRecent studies of male occupations have used Anglican baptisms as a source. However, in areas where nonconformity was strong, a significant proportion of baptisms were missing from parish registers: in Wales, around a quarter of births were to Nonconformist fathers in the years 1813–1820. This study analyses whether there were significant differences between the occupations of Anglican and nonconformist fathers based on a 14 per cent sample of Welsh baptisms. Revised estimates suggest that Anglican data underestimate employment in mining and industry. These estimates are used to give an overview of the Welsh economy c.1817.