*** UPDATE *** AT 7:19 am ET, percentage has increased.
Mitt Romney won 49% of his entire vote margin from just five counties -- the Southeastern and traditionally Democratic counties of Miami-Dade, Broward, Palm Beach, as well as the swing counties of Pinellas and Hillsborough.
Of those five counties, Romney won about 118,000 votes of his about 241,000 vote margin.
Miami-Dade, Broward, and Palm Beach alone accounted for about 31% of his total margin -- with about 74,000 votes.
Vote margin for Romney - 240,548
Palm Beach 22,078
Sub-total: 73,878 (31%)
Grand Total: 117,703 (49%)