American here. When I was in Sweden it felt like their flag was everywhere. Maybe I just noticed it more because I was traveling.
In Brazil I saw their flag plastered on a lot of stuff - clothes, bags, painted on the street - but not so much flying on flag poles.
I see fair amount of US flags here at home, usually at government buildings, cemeteries, and the like. When flown at homes I usually assume the person is on the political right.