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Post Offices by County
CASS COUNTY,
IOWA
ZIP Code
Post Office
Date Established
Date Discontinued
50020
ANITA
50022
ATLANTIC
02/02/1869
50843
CUMBERLAND
51535
GRISWOLD
01/26/1880
51544
LEWIS
12/24/1849
51552
MARNE
50853
MASSENA
50274
WIOTA
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