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Here’s where to put the apartment number in an address
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Sending a letter or package to someone who lives in an apartment? If so, you’re probably wondering how to write out an apartment address. Don’t worry—it’s super easy! Follow the steps below to learn what to include in an apartment address and which line to put the apartment number on.

How to Address an Envelope with an Apartment Number

Write an apartment address like this:
Daniel Martin200 Benjamin Franklin St Apt 45
Philadelphia, PA 12345

1

Write the recipient’s name on the first line.

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  1. You know the drill—write out the first and last name of the person you’re sending the parcel to. [1] Make sure to include the person’s legal name (especially if you’re sending something internationally). [2]
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2

Put their street address and number on the second line.

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  1. Write out the address of the apartment building or complex before listing any specific apartment, building, or room numbers. [3] Feel free to use abbreviations like ST (street), RD (road), BLVD (boulevard), DR (drive), and CIR (circle) to make the address a little bit shorter. [4] Then, include the apartment number right after the building address—just make sure that there’s a clear space between the two. [5]
    • Antonia Moore
      45 Jackson Ave Apt 30
    • Want to save a little space on your envelope or package? Here are a few USPS-approved abbreviations you can use on your mail: APT (apartment), BLDG (building), DEPT (department), STE (suite), RM (room), and FL (floor). [6]
    • Split up the building address and apartment number If there’s not enough space to include them both on the same line. Put the apartment, room, and building info on the line above the building address. [7] Mail machines process addresses from bottom to top (starting with the city/state/zip code), so it makes logistical sense to put the main address below the specific apartment info. [8]
3

Write the recipient’s city, state, and zip code on the third line.

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  1. Start with the name of the recipient’s town or city, followed by a comma. Then, write the recipient’s state abbreviation. Include a space, followed by the recipient’s 5-digit zip code. Click here if you’d like to look up the recipient’s full, 9-digit zip code. [9]
    • Kira Hastings
      10 Almshouse Ave Apt 75
      Chicago, IL 12345
    • If you’re sending mail internationally, include the city and province rather than the city and state. In some countries, you may not have to include a state or province at all.
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4

Include the recipient’s country if they live internationally.

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  1. Write out the full name of the country beneath the completed address, like “USA” or “Canada.” [10] Skip this step if you aren’t sending your letter or package out of the country.
5

Put your address in the return address section.

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  1. Along the top left corner of the envelope or package, write out your legal name and address, as well as your city, state, and postal code. Should an error or mix-up occur, including a return address makes it much easier for the postal service to return the parcel to you. [11]
    • Return addresses are required for certain types of packages, like official mail or mail sent with precanceled stamps.
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Community Q&A

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  • Question
    Where do I add the floor number?
    Janice Tieperman
    Community Answer
    The floor number goes after the base address of the apartment complex, like 10 Main Street FL 3 RM 9.
  • Question
    My understanding about addresses is that you start at the bottom & go up getting more specific. Is this not correct?
    Janice Tieperman
    Community Answer
    You're correct—that's the order in which American mail machines process/read through addresses on letters and packages. These machines start on the bottom, most general line (city/state/zip) before working their way up to the specific address, apartment number, and recipient name.
  • Question
    I have to ship a small bubble mailer with pre-made lines. Is it ok if the bottom line is empty?
    Janice Tieperman
    Community Answer
    What matters most is that you have all of the recipient's information included on the label (like their name, address, apartment number, city, state, and zip code). As long as all of that information is included, you should be fine!
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      Tips

      • If the letter or package is going to someone other than the recipient, include “Care Of” (abbreviated ℅) with the receiver’s name on the second line (e.g., ℅ Trevor Frye), with the rest of the address going beneath. [12]
      • Proofread your address at least twice before sending it in the mail.
      • Phone numbers, email addresses, and other personal information beyond the recipient's full name are not included in the mailing address.
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      Warnings

      • Do not write any part of your address in cursive. Cursive can be hard-to-read, and using it to write your address increases the likelihood of it getting lost.
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      About This Article

      Article Summary X

      To write an apartment address, start by writing the recipient's full name on the center of the envelope or label you're using. Then, write their apartment street address on the line underneath, beginning with the building’s name, then the street name and apartment number. For example, you would write something like “Gaslight Square 506 Main Street Unit 204.” For the third line, write the city, state, and zip code. To learn how to include an “in care of” label when sending mail to the apartment staff, keep reading!

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