Household Registration Act Article 20

When an ROC national applies for Initial Household Registration, the place of birth shall meet one of the following conditions:1. For the application for household registration, the place of birth shall be the province (municipality) or the county (city) where the national was born.2. For an abandoned and helpless child whose birthplace is unknown, the place of birth shall be the place where he/she was found.3. For a child born on a ship or an airplane so that the birthplace cannot be defined, the place of birth shall be the place of registration for such ship or airplane, ROC nationality, or port of registry.4. If the person concerned was placed and educated at welfare institutes for children and youth, and the birthplace is unknown, the place of birth shall be where such institute is located.5. If a child was born in a foreign country or area, the place of birth shall be the country or area to which the birthplace where he/she was born belongs.6.As stipulated in Subparagraph 5, if the birthplace is unknown, the place of birth shall be the place where he/she resides.
中文原文 戶籍法第20條
中華民國人民初次申請戶籍登記時,其出生地依下列規定:
一、申請戶籍登記,以其出生地所屬之省(市)及縣(市)為出生地。
二、無依兒童之出生地無可考者,以發現地為出生地。
三、在船機上出生而無法確定其出生地者,以其出生時該船機之註冊地、國籍登記地或船籍港所在地為出生地。
四、在兒童及少年福利機構安置教養,其出生地或發現地不明者,以該機構所在地為出生地。
五、在國外出生者,以其出生所在地之國家或地區為出生地。
六、不能依前五款規定確定其出生地者,以其居住處所地為出生地。

English translation for reference only; the Chinese text prevails. Not legal advice.