Annex is a community in Malheur County, Oregon, home to about 340 people across 2.5 square miles. It has no ZIP code of its own: it’s part of 97914.
Homes sold for a median of $191 per square foot in the three months ending August 2026, a balanced market.
Mostly Ontario; part is in Annex
Each card is that ZIP code’s whole market, including any part outside Annex. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Annex’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Boise Air Terminal/Gowen Field (BOI)50 miles away |
|---|---|
| Nearest city of 250,000+ | Seattle, WA358 miles away |
| Nearest city of 1 million+ | Los Angeles, CA696 miles away |
Straight-line distances from the center of Annex; 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.
Annex had 225 residents in the 2020 census, down 4% since 2010.
It’s the 314th largest of 420 towns in Oregon by population.
Malheur County grew from 4,203 residents in 1900 to 31,571 in 2020.
Malheur County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 93°F in summer, and winter lows average 22°F. About 10.1 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Ontario Ksrv, OR weather station (about a mile away).
8,527 jobs at 718 businesses in Malheur County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
348 doctors and other health care providers list an office in Annex.
Nearest hospitals
Providers with an office here
| Primary care doctors | 21 |
|---|---|
| Specialist doctors | 26 |
| Dentists | 20 |
| Nurse practitioners and physician assistants | 50 |
| Mental health providers | 205 |
| Physical and occupational therapists | 17 |
| Optometrists | 5 |
| Chiropractors | 4 |
| Pharmacies | 10 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (4 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries (1 nearby)
Theaters and performance venues
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Annex SD 29, Oregon Department of Education, Ontario SD 8C. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Annex Charter SchoolOntario | K–12 | 131 | Charter | 13.5 mi |
| Four Rivers Community SchoolOntario | K–12 | 367 | Charter | 1.5 mi |
| May Roberts Primary SchoolOntario | K–1 | 302 | Public | 0.7 mi |
| Aiken Elementary SchoolOntario | 2–3 | 333 | Public | 0.9 mi |
| Alameda Intermediate SchoolOntario | 4–5 | 355 | Public | 1.7 mi |
| Ontario Middle SchoolOntario | 6–8 | 471 | Public | 1.1 mi |
| Ontario High SchoolOntario | 9–12 | 709 | Public | 0.8 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| St Peter Catholic SchoolOntario | Pre-K–6 | 33 | Roman Catholic | 1.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Ontario.
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.