It will depend on the specific stamp. Washington is on more stamps than any other president. Some of them are very valuable, but most of them are low value. And of course it has to be in good condition and not damaged.
2012
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4 cents. Put it on your next letter.
In good condition they would have a value of about 15 cents. That means that it is the cost of cataloging and storing the stamp and a dealer would not be interested in buying it. Consult a stamp catalog to more carefully identify and value them.
All U.S. stamps since the Civil War can still be used to mail letters and packages. So a 4 cent stamp is worth 4 cents today. If the stamp is old you can check in the catalogs to determine collector value. Few stamps issued since 1950 have significant collector value.
$0.85 mint, $0.25 used
on e-bay they are going for 3 to 7 dollars
If uncancelled and used as postage it is worth (surprise) 4 cents.As a collectible stamp its value will depend entirely on condition, which must be determined by direct observation by an expert in stamps.
20 cents used; 50 cents unused
The US has issued dozens of George Washington stamps, many with a value of 3 cents. You will have to completely identify the stamp to find a value. A catalog, available in most libraries can help you determine the value.
The value of a 4 cent black and white Freedom of the Press US postage stamp depends on its condition, rarity, and demand among collectors. In general, most stamps from that era are valued at less than face value due to their common nature.