In my previous post, I forgot to include the source of the various
numbers not provided by W5ESE.

The current US population came from the "population clock" website:

http://www.census.gov/main/www/popclock.html

which is run by the US Census folks. I'm not sure how often it
updates. Last time I looked it was 309,039,794

The license numbers came from the ARRL website, which is the source of
all the ARS license numbers I've posted:

http://www.arrl.org/fcc/stats.html

As of April 9 2010, the number of current unexpired FCC-issued amateur
licenses held by individuals was:

Novice 16,683
Tech 338,087
Tech Plus 15
General 152,796
Advanced 60,367
Extra 120,631

Total 688,579

which works out to about 1 ham for every 449 people in the USA.

73 de Jim, N2EY