Name a GOPe run city period
Of any size
Jacksonville, Florida
San Diego
Ft Worth
Jacksonville
El Paso
Oklahoma City
Those are all bigger than Portland by population with the exception of OKC, which is slightly less populous.
You can also include Fresno, Mesa, Omaha, Colorado Springs and Miami, but they’re a bit smaller than Portland.
Also noteworthy: New York City, Phoenix, Dallas, Indianapolis tend to bounce between parties, so although they have Democrats for mayors now, they don’t have a stranglehold.