First three digits · Alaska
ZIP Codes Starting with
13 ZIP codes start with 999, sorted at the Ketchikan, AK (SCF 999) sectional center (USPS labeling list L005, effective October 1, 2026) in Alaska: 11 residential ZIP codes across 3 counties and 2 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 999 mean?
The first digit, 9, is one of ten national areas (Alaska, California, Hawaii, Oregon, Washington, American Samoa, Guam, Northern Mariana Islands, Marshall Islands, Micronesia, Palau and Armed Forces Pacific). The first three, 999, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 999 to the Ketchikan, AK (SCF 999) facility. The last two digits pick the delivery area. By residents, the largest town names among the 999 ZIP codes are Ketchikan, Wrangell, Craig, Metlakatla, Klawock and Thorne Bay.
999 is the only prefix the Ketchikan, AK (SCF 999) facility sorts.
Where are the 999 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 999
| County | ||||||
|---|---|---|---|---|---|---|
| 99901 | Ketchikan | Ketchikan Gateway Borough | 13,768 | 7 | $93k | $393k |
| 99903 | Meyers Chuck | Wrangell City and Borough | 1 | 0 | – | – |
| 99918 | Coffman Cove | Prince of Wales-Hyder Census Area | 269 | 8 | $63k | $250k |
| 99919 | Thorne Bay | Prince of Wales-Hyder Census Area | 570 | 12 | $61k | $290k |
| 99921 | Craig | Prince of Wales-Hyder Census Area | 1,596 | 1 | $64k | $303k |
| 99922 | Hydaburg | Prince of Wales-Hyder Census Area | 375 | 3 | $47k | $106k |
| 99923 | Hyder | Prince of Wales-Hyder Census Area | 24 | 1 | – | – |
| 99925 | Klawock | Prince of Wales-Hyder Census Area | 841 | 16 | $61k | $278k |
| 99926 | Metlakatla | Prince of Wales-Hyder Census Area | 1,334 | 10 | $72k | $168k |
| 99927 | Point Baker | Prince of Wales-Hyder Census Area | 27 | 6 | – | – |
| 99928 | Ward Cove | Ketchikan Gateway Borough | PO Box or unique | – | – | – |
| 99929 | Wrangell | Wrangell City and Borough | 2,087 | 1 | $64k | $297k |
| 99950 | Ketchikan | Ketchikan Gateway Borough | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.