Grandfield is a city in Tillman County, Oklahoma, United States. The population was 919 as of the 2020 United States census. It is locate…Grandfield is a city in Tillman County, Oklahoma, United States. The population was 919 as of the 2020 United States census. It is located about 30 driving miles southeast of the county seat of Frederick, and is situated at the intersection of US Route 70 and Oklahoma State Highway 36.
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