Ceir sawl lle o'r enw Washington County gan gynnwys:
- Washington County, Alabama
- Washington County, Arkansas
- Washington County, Colorado
- Washington County, Efrog Newydd
- Washington County, Florida
- Washington County, Georgia
- Washington County, Gogledd Carolina
- Washington County, Idaho
- Washington County, Illinois
- Washington County, Indiana
- Washington County, Iowa
- Washington County, Kansas
- Washington County, Kentucky
- Washington Parish, Louisiana
- Washington County, Maine
- Washington County, Maryland
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- Washington County, Minnesota
- Washington County, Mississippi
- Washington County, Missouri
- Washington County, Nebraska
- Washington County, Ohio
- Washington County, Oklahoma
- Washington County, Oregon
- Washington County, Pennsylvania
- Washington County, Rhode Island
- Washington County, Tennessee
- Washington County, Texas
- Washington County, Utah
- Washington County, Vermont
- Washington County, Virginia
- Washington County, Wisconsin
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