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I believe MSA's are determined by commute patterns. Obviously not enough people are commuting from Raleigh to Durham and vice versa for them to be considered a single MSA. Another state that has this is California. Los Angeles and San Bernardino are part of one large urbanized area, but are separate MSA's due to commute patterns. Same with San Francisco and San Jose.
I believe MSA's are determined by commute patterns. Obviously not enough people are commuting from Raleigh to Durham and vice versa for them to be considered a single MSA. Another state that has this is California. Los Angeles and San Bernardino are part of one large urbanized area, but are separate MSA's due to commute patterns. Same with San Francisco and San Jose.
I think that's what the problem is. These areas have continuous built areas and have the commuting patterns.