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All United States ZIP Codes
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00xxx - 99xxx
002xx - 999xx
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US ZIP Codes by County on
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To see a list of all ZIP codes by County on the selected letter, select the desired County from the list or write the desired County in the appropriate field and click Search.
County
Oxford
Orange
Orleans
Ocean
Otsego
Onondaga
Oswego
Oneida
Ontario
Ohio
Onslow
Orangeburg
Oconee
Oglethorpe
Okaloosa
Osceola
Okeechobee
Obion
Overton
Oktibbeha
Oldham
Owen
Owsley
Ottawa
Oakland
Ogemaw
Oscoda
Oceana
Ontonagon
O'Brien
Ozaukee
Oconto
Outagamie
Olmsted
Otter Tail
Oliver
Ogle
Osage
Oregon
Ozark
Osborne
Otoe
Ouachita
Oklahoma
Okmulgee
Okfuskee
Ochiltree
Otero
Ouray
Owyhee
Okanogan
Orocovis
Oglala Lakota