List of highways numbered 21

For roads named A21 see ; List of A21 roads
Route 21, or Highway 21, can refer to:

International

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Australia

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Austria

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Cambodia

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Canada

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Costa Rica

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Czech Republic

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Greece

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Hungary

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India

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Iran

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Ireland

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Italy

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Japan

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Korea, South

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Moldova

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New Zealand

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Paraguay

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Turkey

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United Kingdom

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United States

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Territories

See also

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Preceded by
20
Lists of highways
21
Succeeded by
22