WESCO International, Inc. revenue for the last year amounted to 21.82 B USD, the most of which — 8.55 B USD — came from its highest performing source at the moment, Electrical & Electronic Solutions, the year earlier bringing 8.61 B USD. The greatest contribution to the revenue figure was made by United States — last year it brought WESCO International, Inc. 16.19 B USD, and the year before that — 16.61 B USD.