ZIP codes in North Slope Borough

10 ZIPs touch North Slope Borough, Alaska. The blue dashed line is the county border; orange ZIPs reach into it.

ZIP codes

cross the county line

10,582

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North Slope Borough ZIP list

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Questions people actually ask

How many ZIP codes are in North Slope Borough, Alaska?

10 ZIP codes reach into North Slope Borough. Every ZIP area here lies wholly inside the county.

Which ZIP code in North Slope Borough has the most people?

99723 (Barrow) has about 4,785 residents, the most of any ZIP touching North Slope Borough, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in North Slope Borough and another county?

Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in North Slope Borough. For one address, pin the exact spot on the ZIP finder to see its county.

Where does this list come from?

ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.

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Updated 2026-11-10 · Where the data comes from