Advertencia: Vea calendarios de días feriados de Post Office®, horarios de los buzones y otras ubicaciones para realizar sus envíos de días feriados. Más Información ›

Envío de correo

Preparing Domestic Mail

Send domestic mail easily with USPS®. Properly preparing your letters and postcards will get them where they’re going on time and save you money.

For how to ship a package, see Sending Packages.

For mail and packages sent from and to the U.S., see Preparing International Shipments.

Ampliar Todos

How to Send a Letter or Postcard

Paso 1: Choose Envelope or Postcard

When mailing a letter or postcard, postage cost depends on the size and shape of the mailpiece. You can save money mailing standard sizes that fit through automated mail-processing equipment.

Size & Weight Determine Price

All envelopes must be flat. If your envelope can’t fit through automated processing equipment it is considered non-machineable and costs more to send. Non-machineable items include lumpy or rigid envelopes, and those that have clasps, string, or buttons. Unusually shaped square or vertical envelopes will also cost more to send.


  • Envelopes must be made of paper.
  • Los sobres deben ser rectangulares para calificar para los precios de cartas.
  • Envelopes larger than letter-size will be charged package process.
  • Large envelopes must be rectangular to qualify for Flat Rate prices.

Tarjetas postales

  • Postcards must be rectangular to qualify for First-Class Mail® prices
  • Oversized postcards will be charged as a letter or large envelope
Size & Weight Requirements – Postcards & Envelopes

Paso 2: Address Your Mail

Write or print your return address and the address you're mailing to clearly in the correct spots to make sure your mail is delivered on time.

Address Format

Envelopes with addresses that are unclear or written in the wrong place may not get delivered.

  • Print addresses neatly in capital letters.
  • Use a pen or permanent marker.
  • No use comas ni puntos.
  • Include the ZIP+4® Code whenever possible.

Write Recipient Address

Write the recipient’s address in the bottom center of the envelope. Include the following on separate lines:

  • Recipient’s full name or company name
  • Full street address
  • Apartment or suite number, if applicable
  • City, State, and ZIP+4 Code

Write Sender Address

Write the sender’s address in the top-left corner. Include the following on separate lines:

  • Sender’s full name or company name
  • Full street address
  • Apartment or suite number, if applicable
  • City, State, and ZIP+4 Code
Postal Address Abbreviations

Special U.S. Addresses

Puerto Rico

Mail to Puerto Rico, the U.S. Virgin Islands, or an APO/FPO/DPO has specific address requirements.

Most Puerto Rico addresses have the same format as standard addresses. Others include an urbanization or community code for a specific area or development. Addresses with an urbanization code, abbreviated URB, should be written on four lines.

SAN JUAN PR 00926-3232

Puerto Rico Address Examples
U.S. Virgin Islands

Las direcciones de las Virgin Islands tienen el mismo formato que las direcciones normales. La abreviatura correcta para este territorio es “VI,” no “US VI” ni “USA VI”.

RR 1 BOX 6601
KINGSHILL VI 00850-9802


Para evitar que los correos ingresen en redes de correo extranjeras, no incluya los nombres de ciudades o países en direcciones de envío APO/FPO/DPO. Asegúrese de incluir la unidad y los números de apartado para las direcciones de envío APO/FPO/DPO (si están asignados).

Military Address Examples

Paso 3: Calculate & Apply Postage

How many stamps you need to mail your letter depends on where it's going, its size, and its weight. Requesting a Certified Mail Receipt or other proof of delivery will add to the price. The current price of a First-Class Mail® Forever® letter stamp is $0.50 and $0.35 for a postcard.

Paying for Postage

There are several things to consider when calculating a postage price.

  • Destino
  • Velocidad
  • Shape and size
  • Special handling and insurance
  • Delivery confirmation receipts

Calcular un precio

Seguro y servicios adicionales

Opciones de franqueo

There are several ways to get postage for your envelope.

  • The Postal Store®
    Shop online for all stamps and ad-on postage for oversized envelopes.
  • Click-N-Ship®
    Print and pay for your own postage for Priority Mail® and Priority Mail Express® envelopes.
  • Post Office® Locations
    Buy stamps at Post Offices or at Approved Postal Providers® such as grocery and drug stores.

Paso 4: Send Your Mail

Mailing your stamped envelope or postcard is easy. You can leave it for your mail carrier to pick up or drop it off in several locations.

To send your letter or postcard:

  • Leave it in your mailbox for carrier pickup.
  • Drop it off in a blue collection box.
  • Take it to a Post Office® lobby drop.
Post Offices & Drop-Off Locations
Powered By OneLink