How to Say "Room Number" in Japanese

部屋番号

heyabangō

The phrase for room number in Japanese is 部屋番号 (heyabangō).

The term 部屋番号 is used to refer to the specific number assigned to a room, whether in a hotel, an apartment or a house.

What does it mean word for word?

The word is a compound of 部屋 (heya), meaning 'room' and 番号 (bangō), meaning 'number'.

As a noun, 部屋番号 does not change its form whether you are referring to one room or multiple rooms.

heyabangō

In Japan, the number 4 is often avoided in room numbers because it is pronounced shi, which sounds identical to the word for 'death'. Many buildings omit the 4th floor or rooms with a 4 in the number to avoid bad luck.
When stating a 部屋番号 like 302, Japanese speakers usually say san zero ni instead of 'three hundred and two'. Using the full number would sound like a quantity of rooms rather than a label.
If a 部屋番号 refers to a room in a hospital, the term 病室 (byōshitsu) is used instead of 部屋, as the prefix 病 means 'illness'.

部屋番号は５です。
My room number is 5.
This sentence is useful for stating your own 部屋番号.
Tatoeba #3576142 by arnab, translation #514759 by CK
お名前と部屋番号をお願いします。
May I have your name and room number, please?
This sentence is useful for requesting a name and 部屋番号.
Tatoeba #226574 by small_snow, translation #63919 by CK
部屋番号をお願いします。
Your room number, please.
Tatoeba #84087 by mookeee, translation #1415601 by CK
一〇一号室 (いちまるいちごうしつ)
Room number 101
2 more sentences on Tatoeba

Ren and Misaki are checking into a hotel together.

蓮 Ren

美咲、部屋番号を教えて。
Misaki, heyanbangō o oshiete.
Misaki, tell me the room number.
美咲 Misaki

はい、部屋番号は４０２号室です。
Hai, heyanbangō wa yon-maru-ni gōshitsu desu.
Yes, the room number is 402.
蓮 Ren

あ、鍵に部屋番号が書いてあるよ。
A, kagi ni heyanbangō ga kaite aru yo.
Oh, the room number is written on the key.
美咲 Misaki

本当だね。行きましょう。
Hontō da ne. Ikimashō.
You're right. Let's go.

Sources

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