Hartline is a town in Grant County, Washington, home to about 182 people across 0.3 square miles. Its ZIP code is 99135.
Homes sold for a median of $48 per square foot in the three months ending August 2026.
Mostly Hartline
Each card is that ZIP code’s whole market, including any part outside Hartline. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Hartline’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Hartline well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | Spokane International Airport (GEG)72 miles away |
|---|---|
| Closer regional airport | Pangborn Memorial Airport (EAT)54 miles away |
| Nearest city of 250,000+ | Seattle, WA152 miles away |
Straight-line distances from the center of Hartline; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Hartline had 180 residents in the 2020 census, up 34% since 2000.
It’s the 562nd largest of 628 towns in Washington by population.
Grant County grew from 8,698 residents in 1910 to 99,123 in 2020.
Grant County, 1910–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 23°F. About 10.9 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Hartline, WA weather station (5 miles away).
24,839 jobs at 2,123 businesses in Grant County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Buying or selling around Hartline? Tell us what you need and when. No agents advertise here yet, so we’ll keep your request for up to 30 days and send it to local agents who join. No obligation, and you choose who to work with.
Loading map…
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.