用美国邮政总局发送邮件很容易! 我们的 video will help you with most letters, cards, and postcards you send domestically (inside the U.S.), including U.S. 美国的领土和军事基地.S. and abroad.

为 how to ship a package, see 如何寄送包裹:国内快递.


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Envelope and postcard


Envelopes are for sending flat, flexible things, like letters, cards, checks, forms, and other paper goods. 为 just 1 $0.68 First-Class 邮件® 永远® 邮票, 你可以寄1盎司(约4张)的普通, 8-1/2" x 11" paper in a rectangular envelope) to anywhere in the U.S.!

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No. 将10个信封的最小和最大尺寸进行比较

Envelopes must be rectangular and made of paper to qualify for letter prices. 你的信封最多可以是11-1/2英寸长x 6-1/8英寸高. (A standard No. 信封长9-1/2英寸,高4-1/8英寸.) You can fold what you put in your envelope, but it needs to stay flat—no more than 1/4" thick.

如果你想发送信件大小的文件而不折叠它们, you can use a large envelope (called a "flat"); the 公寓邮资1美元起.39. 如果你的大信封是非矩形的, rigid (can't 弯曲), 或块状(不均匀厚), 你得付包价.

提示: If your envelope can't fit through 美国邮政总局 mail processing machines, or is rigid, lumpy or has clasps, 字符串, or buttons, 它是“不可加工的”,你需要支付0美元.44 more to send it. (见额外的邮资在步骤3.) You'll also have to pay more if your envelopes are square or vertical (taller than they are wide).

Postcards are for short messages that you don't need to put in an envelope. Save money using a $0.53 postcard 邮票 寄一张标准尺寸的明信片到美国任何地方.S. 标准明信片通常是用纸做的, 长在5英寸到6英寸之间,高在3-1/2英寸到4-1/4英寸之间, and are between 0.007" and 0.016" thick.

大小 & 重量要求-明信片 & Envelopes
Envelope and postcard with return address written in the top left corner and delivery address in the bottom center.

Step 2: Address Your 邮件

Envelopes: Write your address (the "return" or "sender" address) in the top left corner. Write the delivery address (the "recipient" address) in the bottom center.

Postcards: 明信片有不同的格式, so write the delivery address in the space it gives you (on the same side you write your message and put the 邮票).

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打印清楚你的退货地址和送货地址, in the correct spots, 以确保您的邮件准时送达.

Address 为mat Tips

  • 用大写字母整齐地打印地址.
  • Use a pen or permanent marker.
  • 不 use commas or periods.
  • Include the ZIP + 4® Code whenever possible.

Write 发送er Address

Write your address (the "return address") in the top-left corner. 在不同的行中包括以下内容:

  • Your full name or company name
  • Apartment or suite number
  • Full street address
  • City, State, and ZIP + 4 Code

Write Delivery Address

Write the delivery address (the "recipient" address) in the bottom center of the envelope. 在不同的行中包括以下内容:

  • 收件人的全名或公司名称
  • Apartment or suite number
  • Full street address
  • City, State, and ZIP + 4 Code
二级地址的高级提示(如公寓或套房) Postal Addressing Standards

Special U.S. Addresses

Puerto Rico

Some Puerto Rico addresses include an urbanization or community code for a specific area or development. Addresses with an urbanization code, abbreviated URB, should be written on 4 lines:

SAN JUAN PR 00926-3232


U.S. Virgin Islands

Virgin Islands addresses have the same format as standard addresses. The right abbreviation for this territory is "VI," not "US VI" or "USA VI":

RR 1 BOX 6601
KINGSHILL VI 00850-9802


邮件 军事和外交演说 is treated differently:

  • include the city or country name when you send something to an APO/FDO/DPO address in another country. 这将使您的邮件远离外国邮件网络.
  • Do 包括分配的单位和箱号:

UNIT 100100 BOX 4120
FPO AP 96691


当你写好信封地址的时候, 把你要寄的东西放在信封里, 然后合上并密封(用信封的胶水或胶带)。.

Envelope and postcard, each with a 邮票 in the upper right corner

Step 3: Calculate Postage (& 添加保险或额外十大网堵平台)

A First-Class 邮件® 永远 邮票 costs $0.68 放在信封的右上角. (你也可以使用加起来为0美元的任何邮票组合.68.)

如果你的信更重或更大, or if you want to add insurance or extra 十大网堵平台s like Certified 邮件® 十大网堵平台, you'll pay more.

A 普通明信片邮票售价0元.53. 大的或方形的明信片会贵一些.) Put the postcard 邮票 in the space provided near the delivery address.

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信件的邮资主要取决于重量和大小/形状. 你可以用厨房秤称你的信, postal scale、自助十大网堵平台亭或邮局 计数器.

提示: As a rule of thumb, you can send 1 oz (4 sheets of printer paper and a business-sized envelope) for 1 First-Class 邮件® 永远® 邮票 (currently $0.68).

大信封(或扁平信封)的邮资起价为1美元.39 for 1 oz.

Where Can I Buy Postage?

提示: 如果你发送较大的信封(扁平),使用优先邮件® or Priority 邮件 Express® 十大网堵平台, you can use Click-N-Ship® 十大网堵平台 在线支付和打印您自己的邮资.

Additional Postage

If your envelope weighs over 1 oz, you can buy additional postage in the amount you need:

  • Each additional 1 oz is $0.24, for letters up to 3.5盎司和大信封高达13盎司.
  • Nonmachinable 项目, 包括凹凸不平或坚硬的信封, or have clasps, 字符串, or buttons will cost $0.44 more to send. You'll also have to pay more if your envelopes are square or vertical (taller than they are wide).
  • You can also 在邮政商店买1分、2分、3分、4分、5分和10分的邮票.

提示: Put the 邮票 on last; that way, if you make a mistake at any other point, you won't waste a 邮票.

Calculate a Price

Add-On Services

If you want insurance, proof of delivery, signature 十大网堵平台s, or other optional 十大网堵平台s, you'll have to pay extra.

我们的 Insurance & Extra Services page has more details; some of the more common add-on 十大网堵平台s for letters include:

  • Certified 邮件®: Get proof that you mailed your item and that the recipient signed for it.
  • Registered 邮件®:美国邮政最安全的邮件十大网堵平台电子邮件是手动处理的, 单独安全处理, 并在旅途的每一步上签字. The recipient must sign for the mail to confirm delivery (or attempted delivery).
  • Return Receipt: You'll get a printed or emailed delivery record showing the recipient's signature. 您可以将回执与其他十大网堵平台结合使用, including Certified 邮件, Registered 邮件, Priority 邮件 Express® 十大网堵平台, and more.
  • Adult Signature Required: Only an adult (age 21+) can sign for the mail after showing a valid government ID.
发送 your letter or postcard from your mailbox, a blue collection box, or Post Office.

Step 4: 发送 Your 邮件

Once your envelope or postcard has the correct addresses and postage, you can send it several ways, 包括把它放进你的邮箱或者扔进 blue collection box 或者是 Post Office location.

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  • Put your letter inside your mailbox and raise the flag (if you have one).
  • If you have a cluster mailbox, drop it in the outgoing mail slot.
  • 把它扔到一个蓝色的收集箱里.
  • 把它送到邮局的大厅里.

Important Note: If your envelope has postage 邮票s and weighs more than 10 oz or is thicker than 1/2", you can't put it in a collection box; you have to give it to an employee at a Post Office location. See more details on 什么东西可以和不可以放入收集箱?

Post Offices & Drop-Off Locations
Animated image of mail moving at high speed on belts and around drums in an automated sorting machine.

Bonus: 发送 邮件 Pro Tips

The Postal Service uses high-speed sorting machines to help process and deliver 425.3 million mail pieces each day. Here are some extra tips to improve your mail sending experience:

  • Stay flexible不要把坚硬的东西装在纸信封里.
  • 发送修饰过的请柬(婚礼、毕业典礼等).)? 把它们手工注销,或者放在另一个信封里.
  • Need tracking? Learn about your options.

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Flexible and flat 项目 only (like paper or photos, less than 1/4 inch thick). Rigid or lumpy Items (like keys or flash drives) can tear your envelope.

Stay Flexible

Postcards, letter envelopes, and large envelopes (flats) all need to 弯曲 to fit through 美国邮政总局® high-speed sorting machines.

  • OK: Flexible, flat things like stickers, photos, trading cards, etc. should be okay—as long as your envelope stays flat, not lumpy, and less than 1/4" thick.
  • 不可以: Don't put rigid objects (like flash drives, coins, keys, hard plastic card cases, etc.) loose in unpadded paper envelopes: They could get torn out of the envelope, jam the sorting machines, cause a delay, or even get lost.

而不是, for rigid and odd-shaped objects (or things you don't want to get bent), 我们建议使用有衬垫的信封或小盒子和 sending it as a package.

保护特殊信封:使用蜡封、绳子或丝带? Put it inside another envelope.


If you want to send a specially decorated envelope (like some wedding invitations):

  • 您可以为不可加工的一等邮件支付额外费用® 项目, 把你的邮件拿到邮局柜台, and ask the retail associate to hand-cancel your embellished invitations.
  • externally decorated 邀请函:如果你使用蜡封,绳子,丝带等. 在你的信封上,不要试图把它们暴露出来. 而不是, to make sure your envelopes arrive looking the way your designer intended, 把它们放在另一个信封里.

Need 跟踪?

一级邮件不提供跟踪十大网堵平台. 如果您想获得您的信件的跟踪信息:

  • 你可以额外付费使用 Priority 邮件 Express® or Priority 邮件® 十大网堵平台.
  • 您可以通过添加“挂号信”来获得送货确认® or Registered 邮件® 十大网堵平台. (You can even combine it with Return Receipt if you want the recipient's signature.)