Before a question like this can be answered, you have to qualify which geographic area you are talking about.
If you are a typical American citizen, you probably think the world begins and ends at the borders of the United....or as I like to say, the EXCITED States of America.
There IS the rest of the world to consider.
Please reconsider your actual question, then re-submit!
As of 2009 there are 650,000+ motorcycles registered in California.
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In the year of 2009, there were over 595,000 registered motorcycles in Ontario, Canada. If you want to drive a motorcycle in Ontario, they must be registered.
The NHTSA reports over 7 million registered motorcycles in 2007 in the USA. http://www-nrd.nhtsa.dot.gov/pubs/811159.pdf
there are about 355,000 motorcycles regesterd in the state of texas
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There are more than 655,000 licensed motorcyclists and more than 340,000 registered motorcycles on New York's roads. Gearedbike UK
According to the US Deparment of Transportation, there are over 4 million motorcycles registered in the US.
As of 2012, the state of Minnesota had 2,148,272 registered cars, and 241,768 registered motorcycles. The state also had 12,657 registered buses and close to 2,700.000 trucks.
The NHTSA says there were over 7 million motorcycles registered bikes in 2007 in the United States. In addition, there are also unregistered bikes. http://www-nrd.nhtsa.dot.gov/pubs/811159.pdf
There are about 4,401,590 license plates registered in Colorado. Statistics are reported after completed years. In 2011, there were 4,224,590 light trucks and passenger vehicles registered in Colorado. There were also 173,000 motorcycles, and 4,000 buses.