I'm from Spain, it's not uncommon unfortunately, but that's because the flag is appropriated by the right and far right and if you see someone with one you can be 90% sure of the type (homophobe, anti abortion, bullfighting supporter, climate change denier, etc etc)

I am from Germany and no one is raising a flag. Except he is a Nazi. Or it is soccer World Championship.

Southeast Brazil: Unless it's the world cup you're assumed to be a shithead

When I went to Norway I counted the flags I saw. I forget the exact number but I saw maybe 6 in the week I was there. Come back to the US I saw at least 20 coming back from the airport.

It's weirdly common in Denmark. People fly the national flag for birthdays, and some people even decorate the Christmas tree with flag guirlandes. It's seen as an act of celebration rather than patriotism.

https://tenor.com/bRmME.gif

In Scotland, it tends to indicate your political beliefs. People flying the Union Jack are normally unionists and supporters of the monarchy, whereas people flying the Saltire (Scottish) flag are normally nationalists (pro-independence). It's therefore difficult to fly a flag 'neutrally' unless you were to fly both.

Very common in Mexico during September. Otherwise not that common but also not frowned upon. There's no signficance behind it.

I am from India. It was illegal to fly the flag untill a decade ago. It took a supreme court verdict to get the right to fly the flag in private residences. So it is not common at all. You would see government buildings and some schools hoist the flag every day. In my school it was every Friday. I have walked around suburbs in US and almost every house had a flag in their porch. Very big ones too.

I'm in Canada and would say it's not extremely common, but enough so that I wouldn't think twice if I saw the flag on a house. Maybe one in fifty houses has one.

Sometimes it's on clothing too, but nowhere close to the extent that I've seen the American flag on everything when I've visited. You guys seem to really really like your flag!

We also have provincial flags which people will put on their houses, but the one I see most is for Newfoundland and Labrador, which is a different province than mine. It's arguably close to as common as the Canadian flag.

In Germany, official government buildings will have the flag on or in front of it, usually next to a bunch of other (eu, county, city...).

Private citizens will fly the flag for sports reasons, or in more right-wing communities they'll fly either the official flag or the old black-white-red one from empire times. Most people will look at you funny for flying the flag when no sports or eurovision are/is going on.
There is really very little "neutral" ground here.

Here in Canada (southwestern Ontario, anyway) it's around, but not super common. You see it on government buildings (municipal, provincial, and federal), but that's about it. You don't often see it on people's homes, vehicles, or businesses the way you see in the States, and it's not something you see on merch very often outside of tourist traps or Canada Day.

Except, ironically, for at some of the bigger and more famous American retail chains. Walmart and Home Depot both have a Canadian flag planted firmly in every location, it seems. Maybe because they're so used to flying their own flag in the States that they just assume it's what everyone does everywhere?

My country is a former colony of an imperial power so it's flown all the time to reinforce our feeling of sovereignty

It was uncommon in The Netherlands. Except on certain holidays. And when kids get a high school diploma: a flag plus school bag.

But since last year, angry farmers ‘decorated’ the country with flags hung upside down to protest against environmental measures. All kinds of angry right wing people followed.

In the UK, you generally don't see people flying the Union Jack unless its a major sporting event, or its a major governmental sort of building.

Australia: Very unusual. I'll see someone doing it maybe once a month and always think "fucking weirdos". It's more common to see Aboriginal flags, but still uncommon

It's more common to see bogans using it as part or their beach or BBQ attire (eg, maybe an Australian flag stubby cooler)

About 3 days per year I think

I lived in MD for a few years. The flag is everywhere. You can always tell someone from MD, no matter where you are, because the flag is incorporated into their clothing. I've never seen anything like it from anywhere else.

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.

CGP Grey made a YouTube video on proper US state flag design etiquette that I personally agree with. Spoiler alert, most states failed the test.
https://youtu.be/l4w6808wJcU

I'm from Indiana and we're more likely to see our national flag instead of our state flag here, but Indiana isn't known for much anyway.

Australian here. Outside of official government uses, it's generally a sign that someone is a racist fuckwit.

In Brazil it's more common now mainly because of the far right who appropriated it for themselves. Most will identify a person flying our flag as a Bolsonaro supporter, me personally like to stay clear of them.

Here in the Philippines, it's generally around only on government buildings and schools. Some establishments and residences may opt to fly the flag as well, but most of us just don't bother at all.

Generally the flag doesn't have any negative (or positive) connotations. Both the leftists and rightists see the flag equally.

German here. No, we don't do that here. (Exceptions: Football World Cup and weird dudes on camp sites or allotment gardens. Usually a sign to avoid the area.) Interestingly, the fascists don't show the German flag, but the one from the Germany before the current one...

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Austria: not often and I like that. Not a fan of nationalism, so the less visible this is in my life the better. I see flags IRL mainly on government functions and when right wingers parade around, maybe also near football matches, that‘s about it.

I‘d like to think the history with Nazis made it less popular, but the actual amount of far-right voters makes me think I might just live in a happy little bubble and I’d be shocked if I looked into people‘s cellars.