About 36 per cent of people in the region -- which under the World Bank's definition includes Northeast and Southeast Asia -- were living in urban areas as of 2010, up from 29 per cent ten years before.
This suggests the region will see decades more of further population shifts, it said in a report released today.
The report contains data gathered through satellite imagery and "geospatial" mapping which the bank said should help planners ensure that policies will benefit a larger number of those moving to cities, especially the poor.
The data shows that urban areas in East Asia expanded at an average rate of 2.4 per cent per year during the decade, with urban land reaching 134,800 square kilometres in 2010.
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Urban populations rose at a faster rate of 3.0 per cent, according to the report, which also found a direct link between urbanisation and income growth.
China's Pearl River Delta, which incudes Guangzhou, Shenzhen, Foshan and Dongguan, has overtaken Tokyo as the world's largest urban area both in size and population, it said.
As of 2010, the report stated that there were 42 million inhabitants in the Pearl River Delta, a population larger than that of Argentina, Canada or Malaysia.
World Bank urban development expert Abhas Jha said he hopes the report will push policy makers to a shift from a "car centric" to a "people centric" strategy in growing cities like Jakarta and Bangkok.
The report however said that despite the population shift, data shows that only less than one percent of the total area studied is urbanised.