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Post Offices by County
BOULDER COUNTY,
COLORADO
ZIP Code
Post Office
Date Established
Date Discontinued
80510
ALLENSPARK
80302
BOULDER
04/22/1859
80020
BROOMFIELD
80025
ELDORADO SPRINGS
80533
HYGIENE
06/25/1883
80455
JAMESTOWN
80026
LAFAYETTE
02/04/1889
80501
LONGMONT
80027
LOUISVILLE
80540
LYONS
80466
NEDERLAND
80544
NIWOT
80471
PINECLIFFE
80481
WARD
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