I dont think that it matters.

Bob - Thanks for asking the question. I think Debbie Gartner has provided a great answer.

I don't think it will matter either way. Te text is what will be picked up.

Google doesn't recognize it so do what you like.

It does not matter when you do a search on Google, so it probably does not matter for seo either.

I do both, but I usually use the comma, although I don't think it matters for the search engines.  I think google has that one figured out.

Bob Haywood 'city state' is fine - though I am no expert at that. (one of the field treats comma as delimiter.)

I do it both ways

I bow to the experts like Debbie Gartner on SEO advice.  You are obviously paying attention to your rankings on the search engines, Bob. Good for you!

I dont' use the comma.

I'm not sure that it matters anymore.  What I had read a few years ago was not to put a comma before the state.  I think you definitely should put a comma after the street as it looks stupid (and looks like you're illiterate even though you aren't).

It's not all just about the search engines...you have to remember people too.  you have to do well w/ both.  I believe google has prob figured out the comma thing.

What I often do is write it gramatically correct when I write it in writen form and leave out the commas on alt tags (which is for search engines and not for people).  That's my reco.

Good question and I do it both ways. Will subscribe to find the real answer.

I don't know the answer for sure - but I decided a while ago to drop the comma with the thought that it was better without it (for SEO)