Zagreb's population (792,875) Zurich's Population (1,274,943). Zurich should be on this list instead of Zagreb, and Glasgow should be on this list instead of Genoa.
It says "population within city limits " and according to citymayors.com Glasgow (616,000) definitely does not beat Genoa (656,000) and neither does Zürich with a city population of 402,720 to Zagreb's 688,163 according to wikipedia (868,00 in Zagreb to Zürich's 313,000 according to citymayors.com )