Royal City is a city in Grant County, Washington, United States. The population was 1,776 at the 2020 census. Royal City was founded in …Royal City is a city in Grant County, Washington, United States. The population was 1,776 at the 2020 census. Royal City was founded in 1956 and officially incorporated on February 14, 1962. The townsite was previously named Royal Flats, and the entire area Royal Slope, thus the name Royal City. During the 1960s, there was a Titan I ICBM silo located near the town. The Royal Slope was named Washington state's 15th designated wine growing region on September 2, 2020.
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