The Duval data by precinct are on their webpage. Unfortunately, I couldn't find the most recent description of which precincts serve what. So, assuming there wasn't recently any change in precincts and assuming no precincts serve both parts of Jacksonville and parts of the micro suburbs, I just subtracted the results for the precincts that have recently participated in local elections in these suburbs. So, with those two assumptions in mind, we get the following:
City of Jacksonville
McCain Palin 200,675 votes (50.18%)
Obama/Biden 195,900 votes (48.99%)
McCain did win Jacksonville