Traffic & Transportation in South Portland

South Portland's transportation picture combines direct Casco Bay Bridge access to Portland with real, distinctive airport and bus-transit assets.

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The Casco Bay Bridge

The Casco Bay Bridge carries 32,000+ vehicles per day between South Portland and downtown Portland.

Bus transit and airport access

METRO (Route #5 to the Maine Mall/Jetport, Route #1 to Amtrak/Concord Coach) and South Portland Bus Service provide local transit; the Portland Jetport sits within South Portland itself.

Genuinely car-dependent overall

Notwithstanding these transit and airport assets, South Portland runs genuinely car-dependent for most daily trips outside the Portland commute corridor specifically.

Key takeaways

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Last reviewed: 2026-08-28. Independent research; not financial, tax, or legal advice -- confirm current figures with a local professional before making a decision.