In the U.S. there are roughly two million active stamp collectors.
Linn's Stamp News, the leading hobby weekly, estimates there are as
many as two million active stamp collectors in the United States.
New York Times
No Sticker Shock Here: A '53 Corvette for 37 Cents
By MATTHEW HEALEY
Published: August 15, 2005
Linn?s divides the universe of stamp collectors into groups according
to the seriousness of their collecting interest.
4,000,000 stamp savers
1,450,000 casual collectors
230,000 serious collectors
Linn?s: Stamp market roared back in 2004
?Linn's also estimate that there are three different types of stamp
collectors in the country, 300,000 active traders, 1.5 million casual
collectors, and 5 million stamp savers.?
Recent Russian Commemoratives
"Stamp collecting is the collecting of postage stamps and related
objects, such as envelopes (cover)s. It is one of the world's most
popular hobbies, with estimates of the number of collectors ranging up
to 20 million."
According to Australia Post, stamp collecting continues to attract an
estimated 22 million people worldwide.
According to Paul Fraser, Chairman of Stanley Gibbons International,
there are an estimated 30 million stamp collectors world-wide.
Search terms used:
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I hope this is helpful.