History of United States Postal Service rates
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| Date Introduced | Rate for first ounce (USD) | Additional ounces | Postcard rate | Comments |
|---|---|---|---|---|
| March 3, 1863 | .03 (.23) per half ounce | .03 (.23) per half ounce | ||
| March 3, 1883 | .02 (.19) per half ounce | .02 (.19) per half ounce | ||
| July 1, 1885 | .02 (.20) | .02 (.20) | ||
| November 3, 1917 | .03 (.23) | .03 (.23) | War Years | |
| July 1, 1919 | .02 (.12) | .02 (.12) | Dropped back by Congress | |
| 1926 | .02 (.11) | .02 (.11) | .01 (.06) | |
| July 6, 1932 | .03 (.22) | .03 (.22) | .01 (.07) | |
| January 1, 1952 | .03 (.11) | .03 (.11) | .02 (.08) | |
| August 1, 1958 | .04 (.14) | .04 (.14) | .03 (.10) | |
| January 7, 1963 | .05 (.16) | .05 (.16) | .04 (.13) | |
| January 7, 1968 | .06 (.17) | .06 (.17) | .05 (.14) | |
| May 16, 1971 | .08 (.20) | .08 (.20) | .06 (.15) | |
| March 2, 1974 | .10 (.20) | .10 (.20) | .08 (.16) | |
| September 14, 1975 | .10 (.19) | .09 (.17) | .07 (.13) | |
| December 31, 1975 | .13 (.24) | .11 (.20) | .09 (.17) | |
| May 29, 1978 | .15 (.23) | .13 (.20) | .10 (.15) | "A" Stamp Used, value .02 |
| March 22, 1981 | .18 (.20) | .17 (.19) | .12 (.13) | "B" Stamp Used, value .03 |
| November 1, 1981 | .20 (.22) | .17 (.19) | .13 (.14) | "C" Stamp Used, value .02 |
| February 17, 1985 | .22 (.20) | .17 (.16) | .14 (.13) | "D" Stamp Used, value .02 |
| April 3, 1988 | .25 (.21) | .20 (.17) | .15 (.13) | "E" Stamp Used, value .03 |
| February 3, 1991 | .29 (.21) | .23 (.17) | .19 (.14) | "F" Stamp Used, value .04 |
| January 1, 1995 | .32 (.21) | .23 (.15) | .20 (.13) | "G" Stamp Used, value .03 |
| January 10, 1999 | .33 (.20) | .22 (.13) | .20 (.12) | "H" Stamp Used, value .01 |
| January 7, 2001 | .34 (.19) | .21 (.12) | .20 (.11) | Nondenominated Stamps Used |
| July 1, 2001 | .34 (.19) | .23 (.13) | .21 (.12) | Nondenominated Stamps Used |
| June 30, 2002 | .37 (.21) | .23 (.13) | .23 (.13) | Flag and Antique Toy Stamps Used |
| January 8, 2006 | .39 (.20) | .24 (.12) | .24 (.12) | "Lady Liberty Flag" Stamp Used |
Unparenthesized amounts are the actual denomination of the stamps. Parenthesized amounts are adjusted to constant 1982-84 dollars according to the United States Consumer Price Index.
