Grant County, Washington ZIP codes
14 ZIP codes are in Grant County, plus 5 that cross in from neighboring counties. It's part of the Moses Lake, WA micro area.
- ZIP codes
- 14
- Population in these ZIPs
- 97,918
- Avg. median income
- $73,300population-weighted
- Cities & towns
- 14
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Grant County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 98823 | Ephrata | 12,188 | $73,074 | $309,700 |
| 98824 | George | 147 | $44,028 | $176,800 |
| 98832 | Marlin | 87 | $31,964 | $309,100 |
| 98837 | Moses Lake | 49,455 | $74,586 | $360,400 |
| 98848 | Quincy | 12,854 | $87,714 | $420,700 |
| 98851 | Soap Lake | 4,437 | $63,333 | $299,900 |
| 98853 | Stratford | 6 | — | — |
| 98857 | Warden | 4,062 | $61,860 | $282,300 |
| 98860 | Wilson Creek | 277 | $62,500 | $185,100 |
| 99123 | Electric City | 977 | $87,841 | $305,700 |
| 99135 | Hartline | 395 | $80,469 | $216,800 |
| 99321 | Beverly | 1,047 | $75,795 | — |
| 99349 | Mattawa | 8,143 | $61,333 | $440,400 |
| 99357 | Royal City | 3,843 | $57,034 | $346,700 |
ZIP codes partly in Grant County
These ZIP codes are mostly in a neighboring county but cover part of Grant County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 99103 | Almira | Lincoln County | 556 | $53,125 | $230,900 |
| 99115 | Coulee City | Douglas County | 1,369 | $62,708 | $293,600 |
| 99116 | Coulee Dam | Okanogan County | 1,786 | $65,946 | $231,600 |
| 99133 | Grand Coulee | Douglas County | 1,115 | $68,854 | $248,700 |
| 99344 | Othello | Adams County | 19,534 | $64,888 | $333,800 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Grant County
Nearby counties
Frequently asked questions
How many ZIP codes are in Grant County, Washington?
14 ZIP codes are mainly in Grant County, and 5 more ZIP codes from neighboring areas reach partly into it.
What cities are in Grant County?
ZIP codes in Grant County use the city names Beverly, Electric City, Ephrata, George, Hartline, Marlin, Mattawa, Moses Lake, Quincy, Royal City, Soap Lake and Stratford and others.
What metro area is Grant County in?
Grant County is part of the Moses Lake, WA micropolitan statistical area.