I think this is a little bit outdated at least for the Philippines. Goverment documents now primarily use A4 to comply with ISO standards. Some places such as schools may sometimes use the letter size (commonly referred to as short size here) but A4 is now much more common.
It’s getting to be outdated for the US too - while the size is still around, it’s getting pretty rare outside of direct consumer sales. I’ve written several systems that have generated tens of millions of letters for various official communications, and all of the government direct-mailing systems have used A-series paper (or US legal - as far as I’m aware there’s no ISO equivalent to US legal?).
I think this is a little bit outdated at least for the Philippines. Goverment documents now primarily use A4 to comply with ISO standards. Some places such as schools may sometimes use the letter size (commonly referred to as short size here) but A4 is now much more common.
It’s getting to be outdated for the US too - while the size is still around, it’s getting pretty rare outside of direct consumer sales. I’ve written several systems that have generated tens of millions of letters for various official communications, and all of the government direct-mailing systems have used A-series paper (or US legal - as far as I’m aware there’s no ISO equivalent to US legal?).