First three digits · Washington
ZIP Codes Starting with
32 ZIP codes start with 990, sorted at the Spokane, WA (SCF 990) sectional center (USPS labeling list L005, effective October 1, 2026) in Washington: 32 residential ZIP codes across 4 counties (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 990 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, 990, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 990 to the Spokane, WA (SCF 990) facility. The last two digits pick the delivery area. By residents, the largest town names among the 990 ZIP codes are Cheney, Greenacres, Veradale, Deer Park, Liberty Lake and Colbert.
The same facility sorts 7 prefixes, 258 ZIP codes in all: 835, 838, 990, 991, 992, 993, 994.
Where are the 990 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 990
| County | ||||||
|---|---|---|---|---|---|---|
| 99001 | Airway Heights | Spokane County | 9,440 | 1,187 | $63k | $346k |
| 99003 | Chattaroy | Spokane County | 4,810 | 63 | $77k | $428k |
| 99004 | Cheney | Spokane County | 22,871 | 68 | $67k | $421k |
| 99005 | Colbert | Spokane County | 10,815 | 273 | $126k | $561k |
| 99006 | Deer Park | Spokane County | 16,177 | 99 | $72k | $420k |
| 99008 | Edwall | Lincoln County | 317 | 2 | $107k | $508k |
| 99009 | Elk | Spokane County | 4,506 | 56 | $82k | $427k |
| 99011 | Fairchild Air Force Base | Spokane County | 2,931 | 443 | $70k | – |
| 99012 | Fairfield | Spokane County | 1,167 | 12 | $89k | $334k |
| 99013 | Ford | Stevens County | 1,620 | 18 | $50k | $214k |
| 99014 | Four Lakes | Spokane County | 17 | 165 | – | – |
| 99016 | Greenacres | Spokane County | 21,615 | 878 | $104k | $477k |
| 99017 | Lamont | Whitman County | 230 | 3 | $59k | $121k |
| 99018 | Latah | Spokane County | 272 | 8 | $53k | $211k |
| 99019 | Liberty Lake | Spokane County | 12,447 | 558 | $120k | $618k |
| 99020 | Marshall | Spokane County | 16 | 372 | – | – |
| 99021 | Mead | Spokane County | 8,942 | 111 | $86k | $465k |
| 99022 | Medical Lake | Spokane County | 8,767 | 128 | $94k | $390k |
| 99023 | Mica | Spokane County | 800 | 44 | $114k | $735k |
| 99025 | Newman Lake | Spokane County | 5,668 | 124 | $119k | $517k |
| 99026 | Nine Mile Falls | Spokane County | 9,320 | 148 | $101k | $540k |
| 99027 | Otis Orchards | Spokane County | 5,992 | 387 | $75k | $445k |
| 99029 | Reardan | Lincoln County | 2,116 | 19 | $70k | $344k |
| 99030 | Rockford | Spokane County | 919 | 13 | $86k | $362k |
| 99031 | Spangle | Spokane County | 1,251 | 16 | $98k | $424k |
| 99032 | Sprague | Lincoln County | 1,018 | 4 | $62k | $205k |
| 99033 | Tekoa | Whitman County | 832 | 21 | $59k | $253k |
| 99034 | Tumtum | Stevens County | 198 | 9 | – | – |
| 99036 | Valleyford | Spokane County | 1,581 | 41 | $122k | $647k |
| 99037 | Veradale | Spokane County | 16,522 | 2,627 | $88k | $460k |
| 99039 | Waverly | Spokane County | 166 | 406 | $66k | $225k |
| 99040 | Wellpinit | Stevens County | 536 | 5 | $70k | $182k |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.