Over the years the demand for city specific datasets has led to the opening of official city statistic sites. Major metropolis of the world engage into a transparent publication of their everyday data enabling a thorough examination of the happenings and a more open governance.
Below city datasets that I have come across through the years are posted. I must underline that all the dataset will be originated from the official sources. The links will be updated regularly.
Please post us information through an email: firstname.lastname@example.org or in a comment below if you are aware of the presence of more datasets for other cities.