Which metropolitan city has the largest population in the world (as of 2018)?

People have always flocked to the cities , In most Countries the job opportunities are there .unfortunately ,When these jobs dries up then some who cant afford to pay their rent , end up on the streets . The high stress helps to feed the crime , drug addictions and all the other negatives. However ,some of these issues can be minimized ,If we can become our Brothers and Sisters Keepers ,and dont allow ourselves to be divided .

Population of Tokyo is similar to the population of Canada. Also, Tokyo actually has almost 14 million people but that only includes the city proper. In this question, it includes Greater Tokyo/Metropolitan Area of Tokyo

talldrawz610, how many square miles is Tokyo???

thanks for your help.