Looks like I'm getting spam via my registration page, even with a CAPTCHA image. Is there a way (simple) to block a country to see my site?
Like China or Russia?

I'm actually only interested in the U.S. market, some code can only make my site available to the U.S.?

Thanks for any insight.

"Apache on Linux"

Use .htaccess in that case.

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http://www.javascriptkit.com/howto/htaccess5.shtml

country IP list are available from ->

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http://software77.net/geo-ip/

Using iptables is much better, but if you do not have that level of access there is no choice. Using PHP will actually increase the load on the server that is likely to cause performance degradation.