Both clubs come from different areas of Rome. Lazio draws its fans from the north of the city, especially from the prosperous Prati district. Therefore, the club was also seen as a club for the bourgeoisie.

In a city where football is taken extremely seriously, the map is being studied assiduously. First of all it reveals that the ratio between Romanisti and Laziali in the capital city is about 3 to 1 but lower if the range is extended to the entire Lazio region: for every Lazio fan there are 2.3 Roma fans.