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District of Columbia: General Facts
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| District of Columbia Abbreviated |
District of Columbia Flag |
District of Columbia Seal |
| Traditional: D.C. / Postal: DC |
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| Entry to the Union |
| 1871-02-21 (0th) |
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| District of Columbia State Capital |
10 largest District of Columbia cities |
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1. Washington (572,059)
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| District of Columbia Area Codes |
| 202 |
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| Number of counties |
District of Columbia: Area |
| 1 |
Total Area |
68 sq mi (51th) |
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Water Area |
7 sq mi (10.3% of total area) (51th) |
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| District of Columbia: Population 581,530 |
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| District of Columbia: Nickname(s) |
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| District of Columbia: Main Agricultural Products & Exports |
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| District of Columbia: Main Industrial Products & Exports |
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