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Suitable auxiliary data is important in order to assess the potentially detrimental effects of nonresponse on survey estimates. Whereas sufficient individual-level auxiliary data is rarely available, aggregated data is often quite readily accessible. We investigate whether municipality-level data from official administrative registries is useful to explain and predict individuals’ survey response outcomes in two rounds of the European Social Survey (ESS) in Belgium. This study was prompted by the recent publication of the 2011 Belgian Census. This is the first Belgian census produced by linking various national administrative databases instead of a nationwide survey. It offers free and easy access to a broad range of data at the municipality level. We find no consistent results in the two rounds of the ESS, and the overall usefulness of aggregated data appears limited. Individual-level data available from other auxiliary sources is more strongly and more consistently related to survey response outcomes. Nonresponse analyses in the ESS and other surveys would benefit from access to individual-level administrative registry data, but as this is usually restricted, alternative auxiliary data sources such as interviewer observations will need to suffice. ispartof: Statistical Journal of the IAOS vol:33 issue:3 pages:645-659 status: published