I noticed that some companies and institutions write the house number 1 as One, and some institutions write 1.

One Infinite Loop, Cupertino, CA 95014, USA
One Microsoft Way, Redmond, WA 98052, USA
One University Avenue, Mechanicsburg, PA 17055, USA
1 University Heights, Asheville, NC 28804, USA
1 University Gardens, Glasgow, G12 8QQ, UK

Is it a matter of style?
Why does this thing only exist for addresses with house number 1? Is it because the 1 is not obvious as One?

  • 2
    I’d imagine it could be done with any number if they wanted to. Two, Five, Ten, Fifteen Hundred…
    – Jim
    Jul 29, 2022 at 2:57
  • 1
    Not just 1. In Cambridge UK, 101 Science Park is labelled one zero one. And in Birmingham UK, there is "one zero one The Studio" at the Unit 101 Jubilee Trade Centre. Jul 29, 2022 at 11:11
  • 2
    You could justify it in practical terms - a one written as a single stroke is easy to miss or confuse. But usually it is style more than function.
    – Stuart F
    Jul 29, 2022 at 19:05

1 Answer 1


Normally numbers less than one hundred are spelled out in proper English, though this limit may vary. House number are normally written as Arabic numerals since that is how they are presented on each house or building. Such vanity addresses are typically written as O-N- E Celebrity Drive or else what is the point.

  • 1
    This is normal where? Not in the UK, where it's usual to use numerals. I know the US has a different convention for house numbering, involving much larger numbers. Jul 29, 2022 at 7:15
  • 1
    According to a conversation I had with my local letter carrier (and therefore this is anecdotal, not verified), the United States Post Office only requires that the address be UNAMBIGUOUS - but if it's not written in standard form, any delays in delivery are your problem, not the USPS's (i.e., guarantees of timeliness for Express Mail or Priority Mail are not in effect). Generally, in the NYC area, only well-known locations or vanity addresses use non-numeric addressing, and a few are recognized with no number at all (e.g., Grand Central Terminal, many of the museums, City Hall). Jul 29, 2022 at 11:18
  • 1
    @JeffZeitlin in UK many (residential) addresses don't even have a number, just a name. The postcode (zip code) narrows it down to just a few properties anyway. Jul 29, 2022 at 11:22
  • 1
    @WeatherVane - oh, yes, different countries will definitely have different rules and conventions; I did some (superficial) research on this for some SF world-building ideas, and wrote up my findings at freelancetraveller.com/features/preproom/jottings/… - there are quite a number of ways to specify an address... Jul 29, 2022 at 12:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.