I'm almost certain Cecil County has moved from being apart of Philadelphia's CSA to the MSA as a part of Wilmington's metro division. I don't remember ever remember the MSA including MD. Is Philly the only 4 state metro? I didn't look that closely at all, but I didn't think I saw any other.
In 2020, the population of Cecil was 103,000:
https://en.wikipedia.org/wiki/Cecil_County,_Maryland
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