Callao is a city in Macon County, Missouri, United States. The population was 251 at the 2020 census, down from 292 in 2010.
Not who you're looking for? Others named Callao: city and main seaport of Peru · metro station on line D in Buenos Aires, Argentina · littoral province of Peru (1836–1857) · 2019 single by Anna Carina
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