99643 ZIP Code: Old Harbor, Alaska
ZIP code 99643 covers Old Harbor, Alaska. It sits in Kodiak Island. A ZIP code is a US Postal Service mail route, not a boundary on a map, so it describes where post is delivered rather than an administrative area.
Old Harbor, AK sits outside the mainland map frame, so there is no locator for this ZIP code.
| ZIP code | 99643 |
|---|---|
| Place | Old Harbor |
| State | Alaska (AK) |
| County or equivalent | Kodiak Island |
| Phone area codes in Alaska | 1 |
| Country | United States |
Phone area codes in Alaska
ZIP codes and area codes are separate systems drawn for different purposes, so no ZIP code maps to exactly one area code. These are every geographic code used across Alaska.
ZIP codes near 99643
- 99615 Kodiakabout 28 miles
- 99624 Larsen Bayabout 34 miles
- 99550 Port Lionsabout 49 miles
- 99608 Karlukabout 50 miles
- 99619 Kodiakabout 52 miles
- 99697 Kodiakabout 52 miles
- 99644 Ouzinkieabout 58 miles
- 99565 Chignik Lagoonabout 144 miles
Distances are straight-line, between the approximate centres of each delivery area.
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Frequently asked questions
Where is ZIP code 99643?
ZIP code 99643 is in Old Harbor, Alaska, in Kodiak Island. ZIP codes are mail delivery routes rather than mapped regions, so the code identifies a set of addresses the Postal Service serves together, not a district with fixed borders.
What county is 99643 in?
99643 is in Kodiak Island, Alaska. A single ZIP code can straddle a county line, because mail routes were drawn for delivery efficiency and take no notice of county boundaries, so the county shown is the one the code is primarily associated with.
What area code goes with ZIP code 99643?
ZIP codes and telephone area codes are separate systems with different boundaries, so no ZIP code maps to exactly one area code. Alaska uses 1 geographic area code: 907.
Is 99643 a real ZIP code?
Yes. 99643 appears in the GeoNames postal-code dataset as an active US code assigned to Old Harbor, Alaska. Codes that have been retired or never issued do not appear, which is why entering one on this site returns a not-found page rather than a blank record.
Why do ZIP code boundaries look odd on maps?
Because they are not boundaries. A ZIP code is a collection of mail routes, and a route is a line a carrier walks or drives, not an area. Any ZIP code map you have seen is somebody's approximation drawn around the addresses in a code, which is also why two ZIP code maps rarely agree with each other.
Can two addresses in the same ZIP code be in different cities?
Yes, routinely. The Postal Service assigns a preferred city name to each code for addressing purposes, and that name often covers several neighbouring towns, unincorporated areas or a whole postal district. The place shown here is the one the source names for the code, not a claim that every address in it is inside that town's limits.
ZIP code, place, county and location data from GeoNames, used under CC BY 4.0, extracted 2026-08-22. ZIP codes are Postal Service delivery routes, not administrative areas, so a code can cross city and county lines and the place name shown is the one the source records for the code. Coordinates are an approximate centre of the delivery area, not a precise location. Population and time zone are not shown because the source does not publish them.