Here are the 2020 state-based maps of metropolitan and micropolitan statistical areas, collectively known as core based statistical areas (CBSAs).

Here you will find the reference map for the March 2020 Metropolitan and Metropolitan Statistical Areas (CBSAs)

Here you will find the March 2020 reference map for the Combined Statistical Areas (CSAs).

Here are the 2013 State Based Metropolitan and Micropolitan Statistical Area reference maps.

Here is the March 2020 New England City and Town Areas reference map.