How do I indicate a unit number in an Australian postal address?


How do you indicate a unit number when writing the postal address of snail mail?

Australia Post's Addressing guidelines does not mention how to indicate unit numbers.

Wikipedia states that for a flat or apartment, you should have the unit number, then a forward slash, then the street number. However, it does not have a citation for that.

Andrew Grimm

Posted 2013-04-22T09:58:10.873

Reputation: 5 696

Question was closed 2013-04-22T15:53:46.117

1This post has received 10K views. – Andrew Grimm – 2016-10-08T06:49:15.853

Yes, I can imagine that people would have questions about mail, learners or not. But it's still oft-topic for the reasons mentioned above. – Em. – 2016-10-08T07:25:46.810


@AndrewGrimm I have found a very useful document from Australia Post: It might be a little old according to its filename, but it clearly describes how to format unit numbers. It should be like U 2 17 Jones St or 2/17 Jones St. Please note that it is preferred that there are 2 spaces between the unit number and the street number when using the first format.

– Domon – 2016-12-03T00:45:22.337


This still shows up quite highly in search engine results when searching this question, for a couple different wordings of it. Thought I'd pop the answer I found from Auspost after a bit of digging. Page 3 of this document. If anyone knows a more appropriate part of StackExchange for this question, feel free to throw the link there as an answer for me :)

– FreelancerJ – 2019-08-23T01:23:58.457

2I think this is Too Localised for an English Learners site. FWIW, I would put the flat/unit number on a separate line (as "Flat 3", or "Unit 6a", etc.) after the name, and before the "second to last line" containing the "[building] number and name of the street" as mentioned in your link. – FumbleFingers Reinstate Monica – 2013-04-22T13:01:22.137

Actually, I've got to go with Off Topic. This question does not relate to learning English at all, but rather to learning how to properly use the postal service. – Ken Bellows – 2013-04-22T14:25:43.690

@KenB: More specifically, the Australian postal service. But yeah, you're right - it's more Off Topic than Too Localised. – FumbleFingers Reinstate Monica – 2013-04-22T15:21:54.790

16a/100 Main Street, U6a/100 Main Street, Unit 6a/100 Main Street. All of those are acceptable and all are equally likely to end up getting lost in the post. – mcalex – 2013-04-23T11:31:13.960

No answers