Just a clarification of terms:

This list uses the federal “Combined Statistical Area” which encompasses 4 counties. It’s not just “Portland” - it’s the majority of the most populated areas of the state - 600,000 people live in this CSA.

> A larger combined statistical area (CSA), the Portland–Lewiston–South Portland combined statistical area, is defined as the combination of this metropolitan statistical area (MSA) with the adjacent Lewiston–Auburn MSA. The CSA comprises four counties in southern Maine.

https://www.citypopulation.de/en/usa/combmetro/438__portland_lewiston_sou/

The area includes:

Androscoggin county

Cumberland county

Sagadahoc county

York county

Lewiston - Auburn metropolitan statistical area

Portland - South Portland metropolitan statistical area