ZIP Code 99643

99643 is one of Alaska's ZIP codes, delivering to addresses in Old Harbor, Kodiak Island Borough.

City: Old Harbor
Borough or census area: Kodiak Island Borough
State: Alaska
Prefix: 996xx

Where this code sits

99643 is part of the 996xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Old Harbor.

Old Harbor Alaska ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 99643 delivers to without sharing its boundary.

907 Area code 907

ZIP codes nearest 99643

The ZIP codes whose reference points sit closest to 99643.
ZIP code	Distance	Delivers to
ZIP code 99615	28 mi	Kodiak, AK
ZIP code 99624	34 mi	Larsen Bay, AK
ZIP code 99550	49 mi	Port Lions, AK
ZIP code 99608	50 mi	Karluk, AK
ZIP code 99619	53 mi	Kodiak, AK
ZIP code 99697	53 mi	Kodiak, AK
ZIP code 99644	58 mi	Ouzinkie, AK
ZIP code 99663	166 mi	Seldovia, AK

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 99643, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 99643. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.