Next week I'll have to visit someone in Porto and hand him an iPhone 11 which is a gift from his father. He is a visitor to Portugal himself. He provided me with a very unusual address.

Rua Justino Teixeria n 77 1o tras 4300-279

I figured out that 4300-279 is the post code and used Google to find a close address in case he messed up the format and I found something on booikng.com

Rua de Justino Teixeira nº640, Campanhã, 4300-277 Porto, Portugal

So (Rua de Justino Teixeira) is the address but what is with the (n, o and º) symbols?

To make things more complicated he moved from what I assume is a short-let flat to another address

Praceta quinta da bela vista 133 1o dto 4400-261 Vila Nova de Gaia

I find the (1o) to be the most confusing part unless he made a mistake

  • 1
    1o means 1º, sometime the character "o" is used on mistake.
    – CaldeiraG
    Sep 20, 2019 at 14:59
  • @CaldeiraG is it in fact a mistake? I also note that whether or not it is a mistake in Portuguese, the abbreviation no. for "number" is standard in English.
    – phoog
    Sep 20, 2019 at 18:37
  • @phoog yeah, some shopping websites don't accept the º, so you can use o for English for example. it's not a big of a mistake, you can tell it's "number" either way.
    – CaldeiraG
    Sep 20, 2019 at 22:49

2 Answers 2


It is not uncommon for Portuguese (and Spanish) adresses, to include the floor on which the apartment is located. The generally used format for Portugal is:

|---------------------------------  |------------------------------------   |
| MANUEL GASPAR                     | Name + Surname                        |
| LG DR ANTÓNIO VIANA 1, 2o, DTO    | Street + House number, Floor, Side    |
| 1250–096, LISBOA                  | Postcode, Locality                    |
| PORTUGAL                          | Country                               |
|---------------------------------  |------------------------------------   |

Floors are specified either with just the number or number and letter - 1, or 1o. Ground floor id rés-do-chão (r/c). Sides can be left, right, and in front - esquerdo, direito, frente - and are often abbreviated - esq, dto, ft. For more details, this webpage is mighty informative on the topic.


1o means "first" (primeiro). The address denotes an apartment on the first floor.

No or simply N means "number" (número).

  • 4
    And "tras" and "dto" would presumably indicate which door on the given floor. ("Across" and "right" would be my first guess). Sep 20, 2019 at 13:22
  • 2
    I can confirm the answer and the comment from @HenningMakholm, you are correct (being portuguese myself).
    – CaldeiraG
    Sep 20, 2019 at 14:58
  • as a side note, n° is also the short hand for "number" (=numéro) in French.
    – Laurent S.
    Sep 20, 2019 at 15:22
  • 1
    @phoog Alas, for some reason HTML <sup> works in answers but not in comments! Sep 20, 2019 at 20:20
  • 2
    @DavidRicherby Why can't we have simple HTML in comments? on Meta Stack Exchange.
    – phoog
    Sep 20, 2019 at 23:05

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