They met in December 2003 in Mill Valley.

[sunsunmoon]

They met in December 2003 in Mill Valley.
(From http://www.grammarbook.com/punctuation/commas.asp)

They met in Mill Valley in December 2003.
Question 1: Is this correct too?
Question 2: Do you prefer the original if you put more emphasis on when they met, and do you prefer my sentence if you place more more emphasis on where they met?

[bhaisahab]

They met in December 2003 in Mill Valley.
(From http://www.grammarbook.com/punctuation/commas.asp)

They met in Mill Valley in December 2003.
Is this correct too?

Do you prefer the original if you put more emphasis on when they met, and do you prefer my sentence if you place more more emphasis on where they met?

They are both fine.