There are 19 zip codes in Boulder County, Colorado. The most populated is 80020, located in Broomfield. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
8002053,475Broomfield
8050143,222Longmont
8050336,235Longmont
8002734,161Louisville
8002632,675Lafayette
8030230,569Boulder
8030425,617Boulder
8030324,865Boulder
8030124,593Boulder
8030516,280Boulder
803107,597Boulder
805404,637Lyons
804663,442Nederland
80481532Ward
80510522Allenspark
80455402Jamestown
8002545Eldorado Springs
80471Pinecliffe
80544Niwot
showing: 19 rows

Zip Codes in Boulder County, Colorado by Population (2024)