The article explores whether Mexico City is a polycentric metropolis. Building upon previous methodologies, an alternative criterion is proposed for identifying employment centres, using a jobs to working residents ratio, while taking into account economic informality. Although a small set of minor sub-centres is traced, it is found that most jobs are concentrated in a large central agglomeration, with a moderate percentage of jobs concentrated in corridor-like shapes. Within this central agglomeration, are found inner nodes and corridor-like structures that had been identified in previous research as sub-centres. Additionally, economic specialisation is identified with the use of location quotients and the results are compared with those of previous methodologies. It is concluded that Mexico City has a hybrid, although still predominantly monocentric, urban form.