As discussed in http://bit.ly/wardpost, the City of Chicago changed to a new ward map on 5/18/2015, affecting some datasets. This ZIP file contains a CSV export from 5/15/2015 of the "Crimes - 2001 to present" dataset. Due to size limitations, this file had to be separated from the CSV exports of the other datasets, which are at https://data.cityofchicago.org/d/q6z8-94kn. This CSV file contains a close-to-final version of the crimes dataset with the previous ("2003") ward values.
2003 Ward Dataset CSVs - Crimes - 2001 to present