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Originally Posted by tredici
So, if the percent commuting from, say, Marshall County to Morgan and Madison Counties combined was 25%, Marshall County could be brought into the metro area? It seems like if this is true, then the more counties you add, the more likely you'll be to add more in the future.
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Basically, it's a bit of a domino effect. But keep in mind that to even get close to that threshold, dominant counties in a metro area have to have more workers than the working population of such a county. That's usually indicative of mature suburban counties. For instance, it was big news a few years ago in the Chicago area when the census revealed that DuPage County, the second largest in that metro area, had more people commuting into it than out of it for jobs, meaning the county was no longer just a large bedroom community.