Despite the importance of immigration to Australia, there is little systematic research on the causes of support among Australian citizens for increased, stable or decreased immigration. This paper advances our understanding of Australian public attitudes to immigration levels in the light of the established international literature on public opinion and immigration. Using 2013 Australian Electoral Study (AES) data, we show that, as in other countries, Australian citizens’ attitudes to immigrant numbers are partly driven by a combination of sociotropic economic considerations and perceptions of the socio-cultural impact of immigrants. In addition, we argue that political mobilisation has an impact on attitudes toward immigration that has not received sufficient attention. We demonstrate that citizens who accepted the Coalition's rhetoric on asylum seeker arrivals were more likely to want overall immigrant numbers reduced. Finally, we combine the individual level AES data with electoral district level data to test the impact of contact with immigrants on attitudes to immigrant numbers. Australians living in electoral districts with higher percentages of non-white immigrants are more likely to want lower immigrant numbers than those living in districts with fewer non-white immigrants.