when did london's population reach 1 million
History of London During the 19th century, London was transformed into the world's largest city and capital of the British Empire. Its population expanded from 1 million in 1800 to 6.7 million a century later. During this period, London became a global political, financial, and trading capital. In this position, it was largely unrivalled until the latter part of the century, when Paris and New York began to threaten its dominance.
World population In demographics, the world population is the total number of humans currently living, and was estimated to have reached 7.6 billion as of March 2018.[1]