Grant County, WA ZIP codes
There are 14 ZIP codes in Grant County, WA, in 14 towns, from 98823 to 99357. The largest are 98837 (Moses Lake), 98848 (Quincy) and 98823 (Ephrata).
The county seat is Ephrata.
- ZIP codes
- 14
- Towns
- 14
- County seat
- Ephrata
- County FIPS
53025- State
- Washington
- Population
- 101,799
- Median household income
- $73,267
- Land area
- 2,680 sq mi
- Area code
- 509
- Metro area
- Moses Lake
Grant County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Grant County ZIP codes
The ZIP codes of Grant County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Grant County in numbers
About 101,799 people live in Grant County, in 35,398 households, the 13th most populous of Washington's 39 counties. The median household income is $73,267 a year, 25% below the Washington median of $98,141 (US: $80,734). The median owner-occupied home is valued at $299,500 (47% below the Washington median), and median gross rent is $1,116 a month. The median age is 33.7; 18.4% of adults 25 and over hold a bachelor's degree or higher (39.6% across Washington); the average commute takes 20 minutes.
| Population | 101,799 |
|---|---|
| Households | 35,398 |
| Median age | 33.7 |
| Median household income | $73,267 |
| Median home value | $299,500 |
| Median gross rent | $1,116 |
| Bachelor's degree or higher | 18.4% |
| Mean commute | 20.2 min |
| Population density | 38 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Grant County
| Town | ZIP codes | Population |
|---|---|---|
| Moses Lake | 1 | 26,083 |
| Ephrata | 1 | 8,560 |
| Quincy | 1 | 7,998 |
| Mattawa | 1 | 3,616 |
| Warden | 1 | 2,581 |
| Royal City | 1 | 1,683 |
| Soap Lake | 1 | 1,508 |
| Electric City | 1 | 820 |
| George | 1 | 669 |
| Beverly | 1 | 356 |
| Wilson Creek | 1 | 206 |
| Hartline | 1 | 182 |
| Marlin | 1 | 87 |
| Stratford | 1 | 6 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Grant County.
Not sure you are in Grant County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Grant County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
98823 | Ephrata , WA | Standard | 12,188 | $73,074 | $267,300 |
98824 | George , WA | Standard | 147 | $44,028 | $176,800 |
98832 | Marlin , WA | Standard | 87 | $31,964 | $309,100 |
98837 | Moses Lake , WA | Standard | 49,455 | $74,586 | $315,000 |
98848 | Quincy , WA | Standard | 12,854 | $87,714 | $357,500 |
98851 | Soap Lake , WA | Standard | 4,437 | $63,333 | $242,800 |
98853 | Stratford , WA | Standard | 6 | — | — |
98857 | Warden , WA | Standard | 4,062 | $61,860 | $213,300 |
98860 | Wilson Creek , WA | Standard | 277 | $62,500 | $185,100 |
99123 | Electric City , WA | Standard | 977 | $87,841 | $245,600 |
99135 | Hartline , WA | Standard | 395 | $80,469 | — |
99321 | Beverly , WA | Standard | 1,047 | $75,795 | — |
99349 | Mattawa , WA | Standard | 8,143 | $61,333 | $427,800 |
99357 | Royal City , WA | Standard | 3,843 | $57,034 | $326,700 |
Cite this page
zipcodes.pro. “Grant County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wa/county/grant
Underlying data is public domain or openly licensed — sources, vintages and licences.