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New Louisville definition
Since the Census Bureau has clearly defined the new Louisville as only the old city and unincorporated areas, I think there some details needed that need to be added defining Metro Government. First, it is important  to note that a KY Legislative bill (dubbed the Lyndon Bill} prohibits suburban cities from annexing more land. If this were not the case then the unincorp. areas could create their own government and only the old city would again be left.  Second, this definition won't effect the new city's population growth, since nearly all growth is in the unicorpirated areas and nearly all suburban cities are having very slow growth or even populatiuon losses. Third, even if Suburban cities don't count toward the population, their residents can still vote for Metro mayor and council members, and will still receive Metrowide help in such areas as urban planning and emergency services.
Personally, I think the official municipality (the entire county) is what should make up this article, regardless of what the Census Bureau says. The smaller article with the ""balance"" is what should have the information for the census-defined city.  
Your ideas of what the census bureau has defined are not correct. What you are referring to is the Louisville-Jefferson County balance, which is not the same thing as consolidated Louisville-Jefferson County. Both are defined separately by the Census Bureau (see here). This article is about the consolidated Louisville-Jefferson County (which is how the city is legally incorporated). The confusion lies in the Census Bureau's use of balance figures when ranking cities, rather than the consolidated figures. (Although even this use is inconsistant as they seem to use the full consolidated figures for the decennial rankings.)  
The Census Bureau has accepted the Louisville/ Jefferson balance, but not the City/County Consolidation, which is why the suburban populations are not counted in its estimates and won't be in future censuses. Because of the acceptence of the Lou/Jef Balance, my points should be brought up about the ban on suburban city annexation. If this were not the case then the Balance could be quickly eaten up by the suburbs.
Your assertion is not entirely correct. The Census Bureau does, in fact, include the entire consolidated Louisville-Jefferson County in their estimates. They also include a separate figure for the balance:
 170,Louisville/Jefferson County,Kentucky,A,693604,693872,694757,695843,698059,698903,699827
 162,Louisville/Jefferson County (balance),Kentucky,A,551183,551390,552058,552828,554381,555366,556429
That's from the 2005 estimates (the last number is the 2005 estimated population). This article is not about the balance, however. Issues involving the balance should be discussed on the balance article's talk page.  

 Actual Population 
There are too many disputes about the population of the actual city proper. According to the Census bureau estimates, the balance population is 556,429 and not anywhere near 700,000. What is the actual city proper population, as that is to be what is listed? I do not believe that Louisville has a population anywhere near that of Columbus, Ohio. We need to decide the official population of the city proper and correct any and all inaccurate statements regarding the actual population. There are several pages in Wikipedia listing the population as 699,000 (or so), when the Census lists the population as 556,429. I understand that several people (especially those who live in the area) want the population figure to be high so the city can reach a higher status. If it was a city I lived in, I would like to do the same. However, that cannot be done here. An actual, correct population for the city proper and the metro needs to be listed. If we are able to, we need to come up with the balance population of the counties and the actual city. I am a little confused myself, and I did not want to attempt to change anything before it is discussed.  

There have been many people who have debated this over and over again and we have come to the consensus that is now demonstrated in the article.  Please, for the sake of your own knowledge, read all the talk archives that cover this situation.  Since there is a consensus that's currently overwhelmingly not in your favor, you might want to do that research before thinking about flaming things up. — [[User:Stevietheman|