THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
 
 
 
 
 
 
3 entries match your criteria.  

 
 

Historical Markers in Ontario

 
Clickable Map of Malheur County, Oregon and Immediately Adjacent Jurisdictions image/svg+xml 2019-10-06 U.S. Census Bureau, Abe.suleiman; Lokal_Profil; HMdb.org; J.J.Prats/dc:title> https://commons.wikimedia.org/wiki/File:Usa_counties_large.svg Malheur County, OR (26) Baker County, OR (66) Grant County, OR (32) Harney County, OR (4) Canyon County, ID (24) Owyhee County, ID (14) Payette County, ID (7) Washington County, ID (6) Humboldt County, NV (31)  MalheurCounty(26) Malheur County (26)  BakerCounty(66) Baker County (66)  GrantCounty(32) Grant County (32)  HarneyCounty(4) Harney County (4)  CanyonCountyIdaho(24) Canyon County (24)  OwyheeCounty(14) Owyhee County (14)  PayetteCounty(7) Payette County (7)  WashingtonCounty(6) Washington County (6)  HumboldtCountyNevada(31) Humboldt County (31)
Vale is the county seat for Malheur County
Ontario is in Malheur County
Malheur County (26)  ►
ADJACENT TO MALHEUR COUNTY
Baker County (66)  ►
Grant County (32)  ►
Harney County (4)  ►
Canyon County, Idaho (24)  ►
Owyhee County, Idaho (14)  ►
Payette County, Idaho (7)  ►
Washington County, Idaho (6)  ►
Humboldt County, Nevada (31)  ►
 
Touch name above to highlight map location.
Touch blue arrow, or on map, to go there.
1 ► Oregon, Malheur County, Ontario — Malheur Butte —
On Thundered Boulevard (U.S. 26) near Lee Road.
2 ► Oregon, Malheur County, Ontario — Malheur County's Oregon Trail Heritage —
On Thundered Boulevard (U.S. 26) near Lee Road, on the left when traveling east.
3 ► Oregon, Malheur County, Ontario — Ontario Oregon Trail Kiosk —
Near Vietnsm Veterans Memorial Highway (Interstate 84), on the right when traveling west.
 
 
  
  
 
 
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Nov. 11, 2026