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| City | Grand Mound |
| State | Washington (WA) |
| County | Thurston |
| Country | United States of America |
| Timezone | Pacific Time (America/Los_Angeles) |
| Latitude | 46.787879 |
| Longitude | -123.011247 |
| Population | 3,287 |
| Density | 345.3 /km² |
| Incorporated | N/A |
| ZIP Code(s) | 98531, 98579 |
| Area Code | 425 |
| County Seat | Olympia |
| School District | Rochester School District |
Grand Mound is a locality in Thurston County, Washington, United States. It has a population of approximately 3,287. The population density is 345.3 people per km². Grand Mound is located at 46.7879°N, 123.0112°W. It observes the Pacific Time (America/Los_Angeles) timezone. ZIP code: 98579.
Grand Mound occupies a distinctive bend where the Chehalis River begins to widen its embrace, its landscape a gentle transition from the dense evergreen forests of the Cascade foothills to the broader, fertile plains that stretch toward the coast. It lies 12.6 miles west-south-west of Thurston, WA (from Thurston, WA: bearing 245°T), and is situated 5.6 miles north-north-west of Centralia. Here, the air carries the faint, sweet scent of Douglas fir mingling with the richer, earthy aroma of damp soil after a Pacific Northwest rain. Rolling hills, softened by a perpetual haze that lends a pearly luminescence to the afternoon, are interspersed with pastures and the occasional stand of alder, their pale bark catching the diffuse sunlight. The sky overhead often seems vast, a pale blue canvas often brushed with wisps of cloud, and the quiet hum of insect life in the summer months is a constant, unobtrusive companion to the murmur of the distant river. The history of Grand Mound is deeply entwined with the rich agricultural heritage of the Chehalis Valley, a region that has long sustained its inhabitants through the bounty of its land. Early settlers found the fertile soil and the accessible waterway ideal for farming, establishing a tradition that continues to shape the local economy today, with pastures and fields of hay and grain painting broad strokes across the countryside. While not a hub of heavy industry, Grand Mound has historically been a nexus for local commerce, a place where farmers brought their produce and goods, and its character is defined by a quiet self-sufficiency. A particular charm of Grand Mound lies in its unpretentious beauty, a place where the rhythm of the seasons dictates the pace of life, and the legacy of those who first worked this land is felt in the enduring connection to the soil and the river.
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This page provides an embedded street and satellite map of Grand Mound, Washington — switch between views using the small square in the bottom left-hand corner of the map. Coordinates: 46.787879, -123.011247. 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 Grand Mound and Thurston County.
Detailed location data for Grand Mound includes the ZIP code (98531), telephone area code (425), county seat of Thurston County (Olympia), and school district assignment (Rochester School District). 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 Grand Mound 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. |