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33 zip codes in the 303 area code
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Cities and zips in ADAMS County:
AURORA: 80019
BENNETT: 80102
STRASBURG: 80136
WATKINS: 80137

Cities and zips in ARAPAHOE County:
AURORA: 80018
BYERS: 80103

Cities and zips in BOULDER County:
BOULDER: 80304 80305 80306 80307 80308 80309 80310 80314 80303 80301
ELDORADO SPRINGS: 80025
ERIE: 80516
LAFAYETTE: 80026
LOUISVILLE: 80027
NIWOT: 80544

Cities and zips in BROOMFIELD County:
BROOMFIELD: 80020 80038 80023

Cities and zips in DENVER County:
DENVER: 80293

Cities and zips in JEFFERSON County:
BUFFALO CREEK: 80425
CONIFER: 80433
DENVER: 80215 80227
GOLDEN: 80403
PINE: 80470

Cities and zips in MORGAN County:
ORCHARD: 80649

Cities and zips in WELD County:
ROGGEN: 80652

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