Besides, the way metros are classified, Austin and San Antonio will likely never be part of the same metro. The reason is metros are classified based on a certain percentage of workforce commuters from one city commuting to another. Counties are used as the base. The entire county of Bexar County where San Antonio is only has about 2,000 commuters into Travis County. And that is out of 1.7 million of Bexar County's total population. For San Antonio to be added to Austin's metro, there would have to be 425,000 daily commuters into Travis County. That just isn't going to happen. And for Austin to be added to San Antonio's metro there would have to be 275,000 commuters from Austin to San Antonio.
From this article:
http://www.mlive.com/business/west-m..._new_gran.html
Quote:
Metro areas are derived from commuting data.
Outlying counties qualify to be part of the metro area if 25 percent of its workforce commutes to the central county, he said.
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Read that article. Some metros can even lose counties if the commuter percentage drops below 25 percent. That article is talking about Grand Rapids, Michigan, and that very thing happened to their metro. They lost two counties in their metro.
Now I could see Austin and San Antonio becoming a "MSA" - a metropolitan Statistical Area and or a "CSA" - a combined statistical area.