ZIP code · Coulee City · Washington · United States
ZIP code 99115 — Coulee City
ZIP code 99115 serves Coulee City, Washington.
- Postal code
- 99115Single source Value from one source, not cross-checked.
- City
- Coulee City
- County
- Grant FIPS 53025
- State
- Washington
- Country
- United States
- Coordinates
- 47.5966, -119.2758 — precision precise (locality)
View on OpenStreetMap - Population
- 1,306 (ZCTA, ACS 5-year)
- Population density
- 3 / sq mi
- Land area
- 420 sq mi (1,087.8 km²) (ZCTA, ACS 5-year)
- Median household income
- $49,519
- Per-capita income
- $25,463
- Median age
- 52.6
- Households
- 536
- Housing units
- 974
- Median home value
- $207,600
- Median gross rent
- $726 / month
- Congressional district
- WA-4 (119th Congress)
- USDA hardiness zone
- 6b (-5 to 0 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
- Area code
- 509Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 99115 with another ZIP · ZIPs within 25 miles · distance from 99115
Map of ZIP code 99115
Climate — monthly normals
Warmest month Jul (avg high 86°F), coldest Jan (avg low 23°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 40 | 50 | 60 | 70 | 76 | 86 | 86 | 76 | 60 | 43 | 33 |
| Avg low °F | 23 | 25 | 31 | 36 | 44 | 49 | 57 | 57 | 48 | 38 | 29 | 23 |
| Precip in | 1.3 | 0.7 | 1.0 | 0.8 | 1.1 | 0.9 | 0.6 | 0.4 | 0.3 | 0.9 | 1.3 | 1.6 |
NOAA 1991–2020 climate normals from the nearest station: HARTLINE (10.1 mi) · NOAA NCEI
Places in ZIP 99115
- 3 schools
- 2 supermarkets
- 3 restaurants & cafés
- 1 bars & pubs
- 4 parks
- 4 playgrounds
- 1 libraries
- 3 places of worship
- 1 banks
- 2 gas stations
- 2 EV charging stations
- 1 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page