If there are three doors in a building numbered No.1, No.2, and No.3. When referring to them collectively, do I say "Doors No. 1, 2, and 3"; or "Door Nos. 1, 2, and 3"?

  • Some contexts will call for "door no. 1 and door no. 2." Commented Apr 2, 2023 at 12:30

1 Answer 1


It primarily depends whether you're referring to the doors or the numbers [the "signage"]. Thus...

1: Doors number 1 and 2 are open, but that door number 3 is closed
2: Door numbers 1 and 2 are visible, but I can't see the number on that door

In some contexts, the door number effectively represents the door it's on, so it doesn't really make any difference which you pluralize...

3: I searched the corridor, but couldn't find doors number 1 and 2
4: I searched the corridor, but couldn't find door numbers 1 and 2

But it's worth pointing out that syntactically, I have no problem at all with this sentence pulled out by Google Books...

5: Door number 113 is located in Room 102 while doors numbers A03 and A04 are located in the Ash Silo Enclosure

  • 1
    I'd be quite happy with just 'doors 1 and 2 are open, and 3 is closed'. Commented Apr 1, 2023 at 12:10
  • 1
    So would I. But that doesn't imply there's anything wrong with including the word "number" - whether pluralised or not. Commented Apr 1, 2023 at 12:14

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