Let this American writer and editor from Boston set the Californian straight.
In American usage, CA is the postal abbreviation for California. And that's all it is -- ever. To use CA in text to denote California is simply incorrect usage. In fact, to use CA as a reference to California in anything other than a postal address is wrong.
When referring to California in anything other than a postal address, the correct abbreviation is Calif. or the fully spelled out Califormia.
Don't believe me? You don't have to! Simply refer to The Associated Press Stylebook section on state abbreviations and proper usage. There's a whole page devoted to this specific topic.
(Of course, if you should go to
http://www.ca.com , you'll get the Web site of the software company Computer Associates, but that's another topic entirely. And yes, according to the AP Stylebook, "Web" is correct and "web" is not.")
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When I ask which Canon lenses are best,
people tell me to 'go to L.'