Hartline Washington ZIP Codes
Hartline holds a single ZIP code.
Every ZIP code in Hartline
| ZIP code | County |
|---|---|
| 99135 | Grant County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Hartline codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Hartline. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Hartline ZIP code begins 991. Those first three digits identify the sectional center facility that processes mail for this part of Washington. Statewide that range covers 67 ZIP codes, so Hartline accounts for 1% of it.
Every Washington ZIP prefix and the region it covers →
Area codes covering Hartline
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Hartline occupies.
Hartline Washington area codes in full →
Where Hartline's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Hartline
| City | Distance | ZIP codes |
|---|---|---|
| Almira Washington ZIP codes | 8.1 mi | 1 ZIP code |
| Coulee City Washington ZIP codes | 10 mi | 1 ZIP code |
| Electric City Washington ZIP codes | 16 mi | 1 ZIP code |
| Grand Coulee Washington ZIP codes | 18 mi | 1 ZIP code |
| Wilson Creek Washington ZIP codes | 18 mi | 1 ZIP code |
| Wilbur Washington ZIP codes | 19 mi | 1 ZIP code |
| Coulee Dam Washington ZIP codes | 20 mi | 1 ZIP code |
| Elmer City Washington ZIP codes | 23 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.