Riverside, Umatilla County
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| City | Riverside |
| State | Oregon (OR) |
| County | Umatilla |
| Country | United States of America |
| Timezone | Pacific Time (America/Los_Angeles) |
| Latitude | 45.675188 |
| Longitude | -118.737294 |
| Population | 362 |
| Density | 231.6 /km² |
| Incorporated | N/A |
| ZIP Code(s) | 97321, 97917, 97801 |
| Area Code | 541 |
| County Seat | Pendleton |
| School District | Pendleton School District 16 |
Riverside is a locality in Umatilla County, Oregon, United States. It is a small community with a population of 362. The population density is 231.6 people per km². Riverside is located at 45.6752°N, 118.7373°W. It observes the Pacific Time (America/Los_Angeles) timezone. ZIP code: 97801.
Riverside rests in the embrace of rolling hills, where the Columbia River, a vast, shimmering ribbon, dictates the horizon and whispers its ancient stories to the dry, wind-scoured landscape. It lies 28.2 miles south-south-west of Whitman, WA (from Whitman, WA: bearing 205°T), and is situated 2.5 miles east of Pendleton. The air here carries the scent of sun-baked earth and distant sagebrush, a potent perfume that hangs heavy in the warm afternoons, while the sky stretches an endless, pale blue canvas, occasionally broken by the sharp, dark silhouette of circling hawks. The land itself, a tapestry of ochre and muted greens, slopes gently towards the water, dotted with hardy grasses that sway like a silent, golden sea under the relentless sun, and the occasional hardy juniper tree, a testament to resilience in this arid beauty. This stretch of Umatilla County has long been a crossroads, shaped by the mighty Columbia and the agricultural bounty it irrigates, a legacy evident in the neat rows of crops that fan out from the riverbanks, a stark contrast to the untamed wildness of the surrounding high desert. For generations, the economy of Riverside has been intrinsically tied to the river’s flow and the fertile soil it nourishes, supporting an agricultural community that harvests wheat, corn, and other staples, their livelihoods a quiet dance with the seasons. The spirit of this place is one of enduring practicality, a stoic grace born from the challenges and rewards of living in harmony with such a powerful, elemental landscape, where the sun’s arc across the sky marks the slow, steady passage of time.
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This page provides an embedded street and satellite map of Riverside, Oregon — switch between views using the small square in the bottom left-hand corner of the map. Coordinates: 45.675188, -118.737294. Live weather conditions are sourced directly from the National Weather Service, with current observations and a 7-day forecast also powered by Open-Meteo. Real-time local news and world news feeds keep the page current, while a Wikipedia summary or an editorially written description provides background on Riverside and Umatilla County.
Detailed location data for Riverside includes the ZIP code (97321), telephone area code (541), county seat of Umatilla County (Pendleton), and school district assignment (Pendleton School District 16). These are among the most commonly searched location details for any US city or town.
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity — ensuring the correct Riverside is identified even where the name is shared across multiple counties or states. Population figures are sourced from the 2020 US Census.
| Page generated | July 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. Location verified by proximity — not name matching alone. |