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  1. Dupo, Illinois, United States [Populated Place] is in St. Clair County; location is 3830'58"N 9012'37"W [SourceGSP]
  2. Dupo, Illinois, United States [Village]; population was 3,164 in 1990; housing units was 1,358 in 1990; location is 3831'N 9013'W; land area is 3.00 square miles (1,919 acres); FIPS code is 21254 [SourceCBP]
  3. Dupo, Illinois, United States Postal Service Zip Code is 62239 [SourcePSZ]

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