Around 98 percent of Japan's population live within one hour by car or train of the proposed route, Tokyo organisers added.
The decision followed a months-long investigation into alleged mismanagement at the crisis-riddled International Boxing Federation, the AIBA.
Tickets for the 33 sports range from the cheapest general tickets at 2,500 yen ($23) to an eye-watering 300,000 yen ($2,730) for the best seats at the opening ceremony.
The Queensland state capital is mulling whether it can justify the expense of hosting such a major event, and has carried out feasibility studies which Bach viewed during a visit.
In between, competition will be spread over 17 exciting sessions at Tokyo's Olympic Stadium.
Other sports, including rugby sevens, triathlon and mountain biking have also seen schedules shifted to avoid the worst of potentially blistering temperatures for the July 24 to August 9 Games in Tokyo.
IOC evaluation commission chairman Octavian Morariu revealed the figures Saturday after an inspection of proposed sites in the northern Italian regions of Lombardy and Veneto.
The IOC Executive Board had on Tuesday softened its position on the drug-plagued sport which threatens its exclusion from the Olympics.
The shiny rose-gold torch, which is 71 centimetres long and weighs 1.2 kilograms, uses aluminium construction waste from temporary housing built for victims of the 2011 quake and tsunami.
The 71-year-old said he would also be stepping down from the International Olympic Committee.
Addressing an audience of 2,000 industry leaders and experts in Barcelona, the IOC head outlined his vision of how digital technology will transform the way that people experience the Olympic Games.
The staple of urban street culture is set to make a splash on its Olympic debut at the Paris 2024 Games.
Sixteen qualifying places for the Tokyo Games were to be decided at the opening shooting World Cup event in New Delhi. But Vladimir Lisin, president of the ISSF world body, said these would now go to other qualifying events.
India has also expressed an interest in hosting the 2032 games while North and South Korea have said they might enter a joint bid.
The IOC are insisting the joint teams take part in Olympic qualifying stages, with the participation of the various international federations.