Here is the the official rate information provided by the U.S.P.S. for
first-class mail and post cards. There was no standard national rate
from 1854-1863, during which time rates were determined by weight and
distance for delivery.
Letters
Per
Effective Date 1/2 Ounce
March 3, 1863 3
March 3, 1883 2
Per Ounce
July 1, 1885 2
November 3, 1917 3
July 1, 1919 2
July 6, 1932 3
August 1, 1958 4
January 7, 1963 5
January 7, 1968 6
May 16, 1971 8
March 2, 1974 10
Each
First Additional
Ounce Ounce
September 14, 1975 10 9
December 31, 1975 13 11
May 29, 1978 15 13
March 22, 1981 18 17
November 1, 1981 20 17
February 17, 1985 22 17
April 3, 1988 25 20
February 3, 1991 29 23
Postal cards (Postal Service Issued) and Postcards (Privately
Manufactured)
Postal
Effective Date Cards Postcards
May 1, 1873 1 --
July 1, 1898 1 1
November 3, 1917 2 2
July 1, 1919 1 1
April 15, 1925 1 2
July 1, 1928 1 1
January 1, 1952 2 2
August 1, 1958 3 3
January 7, 1963 4 4
January 7, 1968 5 5
May 16, 1971 6 6
March 2, 1974 8 8
September 14, 1975 7 7
December 31, 1975 9 9
May 29, 1978 10 10
March 22, 1981 12 12
November 1, 1981 13 13
February 17, 1985 14 14
April 3, 1988 15 15
February 3, 1991 19 19
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