The number was probably small—most likely only in the low thousands, and in many places far fewer before the Communist takeover in 1949. The best- supported wording from the sources is that there was a “small number of Europeans” living in the PRC during the Mao era, while foreign communities in major treaty-port cities like Shanghai had already shrunk sharply by then.

What that means

  • Europeans in China were not a large settled population nationwide; they were concentrated in a few cities and institutions.
  • Many were diplomats, missionaries, traders, journalists, or technical experts rather than long-term migrant communities.
  • One source on Mao-era Europeans explicitly says the community was “very small,” even compared with the early 1970s.

Best rough estimate

For the whole of China , a cautious estimate would be a few thousand Europeans at most by the late 1940s , and likely fewer outside major foreign enclaves. The available sources do not give a single exact total for “all Europeans in China” right before 1949, so any precise number would be speculative.

Context

If you mean the treaty-port and concession era , foreign populations could be much larger in specific places. For example, Shanghai had about 100,000 foreigners by 1900 , but that figure includes many non-Europeans and reflects an earlier period, not the eve of communist rule.

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InterpretationAnswer
All Europe- wide residents in China, late 1940sProbably only a few thousand, with no clean exact count available
Specific foreign districts in major cities earlier onCan be much larger locally, especially in Shanghai and other ports
A good plain-English answer is: **not many—likely just a small remnant community rather than a sizable population**.