County ZIP codes · Washington · FIPS 53025
Grant County, WA ZIP Codes
Grant County, Washington has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 14 of the residential ones lie mainly in Grant County and 5 mainly in a neighboring county; 9 cross the county line. Median household income ranges from $57,034 in 99357 (Royal City) to $87,714 in 98848 (Quincy) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Grant County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $61,860 and $73,074.
They carry 19 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 19 residential ZIP codes in Grant County
14 ZIP codes lie mainly in Grant County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 98837 | Moses Lake | 49,455 | 102 | $75k | $315k | 100% |
| 98848 | Quincy | 12,854 | 28 | $88k | $358k | 98% |
| 98823 | Ephrata | 12,188 | 41 | $73k | $267k | 73% |
| 99349 | Mattawa | 8,143 | 30 | $61k | $428k | 100% |
| 98851 | Soap Lake | 4,437 | 30 | $63k | $243k | 100% |
| 98857 | Warden | 4,062 | 24 | $62k | $213k | 69% |
| 99357 | Royal City | 3,843 | 18 | $57k | $327k | 100% |
| 99321 | Beverly | 1,047 | 30 | $76k | – | 100% |
| 99123 | Electric City | 977 | 49 | $88k | $246k | 100% |
| 99135 | Hartline | 395 | 2 | $81k | – | 100% |
| 98860 | Wilson Creek | 277 | 3 | $63k | $185k | 100% |
| 98824 | George | 147 | 154 | $44k | $177k | 100% |
| 98832 | Marlin | 87 | 0 | $32k | $309k | 70% |
| 98853 | Stratford | 6 | 0 | – | – | 100% |
Partly in Grant County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 99115 | Coulee City | 1,369 | 3 | $63k | $247k | 30% |
| 99103 | Almira | 556 | 2 | $53k | $231k | 24% |
| 99344 | Othello | 19,534 | 40 | $65k | $282k | 19% |
| 99133 | Grand Coulee | 1,115 | 6 | $69k | $230k | 11% |
| 99116 | Coulee Dam | 1,786 | 38 | $66k | $239k | 2% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
9 ZIP codes of Grant County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Grant | Elsewhere |
|---|---|---|
| 99344 | 19% | Adams County65%; Franklin County16% |
| 98848 | 98% | Douglas County2% |
| 98823 | 73% | Douglas County27% |
| 98857 | 69% | Adams County31% |
| 99116 | 2% | Okanogan County98% |
| 99115 | 30% | Douglas County70% |
| 99133 | 11% | Douglas County82%; Lincoln County7% |
| 99103 | 24% | Lincoln County76% |
| 98832 | 70% | Lincoln County29%; Adams County1% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Grant County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Grant County's ZIP codes use 3 prefixes: 988, 991 and 993.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 988 | Wenatchee, WA (SCF 988) | 9 | 46 |
| 991 | Spokane, WA (SCF 990) | 6 | 67 |
| 993 | Spokane, WA (SCF 990) | 4 | 36 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.