There are 18 zip codes in Boulder County, Colorado. The most populated is 80501, located in Longmont. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
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
804710Pinecliffe
805440Niwot

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