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- 1900sScott 294-373
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- 1930sScott 682-858
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- One-of-a-Kind Stamps
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- 20th Century
- 1940sScott 903-986
- 1950sScott 987-1138
- 1960sScott 1139-1386
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- 1990sScott 2439-3369
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- Scott O1-O9Agriculture
1873 - Scott O10-O14Executive
1873 - Scott O15-O24Interior
1873 - Scott O25-O34Justice
1873 - Scott O35-O45Navy
1873 - Scott O47-O56Post Office
1873 - Scott O57-O71State
1873 - Scott O72-O82Treasury
1873 - Scott O83-O93War
1873 - Scott O94-O120Soft Paper
1879 - Scott O121-O126Postal Savings
1910 - Scott O127-O163Modern Officials
1983 to 2009
- Scott O1-O9Agriculture
- Parcel Post (Q)
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