Home District of Columbia Zip Codes, United States

Enter an address for District of Columbia to find the zip code.

Latest Zip codes found in District of Columbia

1400 Independence Ave SW, Washington, DC
2100 Martin Luther King Jr Ave SE, Washington, DC
820 Kennedy St NE, Washington, DC
Washington, DC
1400 Defense Blvd, Washington, DC
1815 45th St NW, Washington, DC
854 21st St NE, Washington, DC
854 21st St NE #7, Washington, DC
The White House, 1600 Pennsylvania Ave NW, Washington, DC
Washington, DC
Washington, DC
Washington, DC
Washington, DC
2400 6th St NW, Washington, DC
L St NE, Washington, DC
1600 Pennsylvania Ave SE, Washington, DC
60 L St NE, Washington, DC
Bolling AFB Bike Trail, Washington, DC
Washington, DC
1200 New Jersey Ave SE, Washington, DC
1401 Constitution Ave NW, Washington, DC
200 Constitution Ave NW, Washington, DC
1000 Independence Ave SW, Washington City, DC
200 Independence Ave SW, Washington, DC
451 7th St SW, Washington, DC
400 Maryland Ave SW, Washington, DC
1849 C St NW, Washington, DC
950 Pennsylvania Ave NW, Washington, DC
810 Vermont Ave NW, Washington, DC
1500 Pennsylvania Ave NW, Washington, DC
Harry S. Truman Building, 2201 C St NW, Washington, DC
1301 Independence Ave SE, Washington, DC
1301 Independence Ave SW, Washington, DC
4718 46th St NW, Washington, DC
Washington, DC
1613 V St NW, Washington, DC
730 12th St NW, Washington, DC
ASAE CENTER, 1575 I St NW, Washington, DC
300 D St SW, Washington, DC
Washington, DC
1100 Independence Ave SW, Washington, DC
3333 Idaho Ave NW, Washington, DC
PARCEL RETURN SERVICE, DC
Washington, DC
302 N St NW, Washington, DC
391 Brookley Ave SW, Washington, DC
Washington, DC
200 K St NW, Washington, DC
Washington, DC
1600 Independence Ave SW, Washington, DC

US ZIP Codes

United States ZIP codes are postal codes that are used to assist the USPS (United States Postal Service) route mail in a quick and efficient manner. ZIP codes are also commonly referred to as postal codes. The abbreviation ZIP stands for Zone Improvement Plan. The 5 digit format was popularized in 1963, however the additional 4 digits after the dash was later introduced into the system (zip+4 digit code).

These additional digits better assist the United States Postal Service to more accurately group mail documents for delivery. The USPS originally created the ZIP code system, however other shipping services like UPS and FedEx utilize these Zip codes for regulating, calculating, and sorting packages along with precisely monitoring shipping rates.

Types of Zip Codes

  • High volume addresses (example - 20524 - FBI in Washington, DC)
  • PO Box (example - 35241 for the PO Box of Norfolk, VA)
  • Military ZIP codes
  • Standard ZIP codes (everything else)

Assignment of ZIP codes and Mail Sorting

Within the zip code structure, the first digit of a US ZIP code represents a group of US states. The main purpose of ZIP codes is efficiency for the delivery of US mail. Some codes cover multiple states to ensure mail is routed as well as delivered in an effective manner. The next 3 digits of a ZIP code help determine the mail facility (AKA – sectional center facility or sec center) which is primarily used to sort and process all mail within that particular state. The last 2 digits represent where the mail will be distributed according to the local post offices. Sectional center facilities are never open to the public and sort all mail documents during the night hours.

The additional 4 digits after the zip code is never required, but certainly helps aid the postal office with additional mail sorting. These 4 digit numbers, followed by the zip code correspond to high volume receivers, apartment complexes, or city blocks. It’s very common for a PO Box to correspond to a zip code along with these appended 4 digits. This is not a universal rule however, zip codes + 4 digits must be confirmed for each PO Box address.