Fellow Countryman, Japanese National, Compatriot
noun
A home country person is a fellow countryman or compatriot (only for Japanese people though). In Japan, you're a Japanese national.
ほうじん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
アメリカには在留邦人はどのくらいいるんですか。
How many Japanese residents are there in the United States?