555US | US ZIP Code Generator | Find ZIP Codes by City, State & County

What is 555US.Net

555US is a web application or app known as zipcode generator that allows users to generate US ZIP Codes, US Postal Codes and US Maps for selected State, City or County easily and instantaneously.

555US simplify the process of finding US ZIP Code, US Postal Code and US Maps by compiling all codes in a single select interface known as 555us ZIP code generator and displaying them instantly based on selection of US City, US State or US County.

555US.Net Functions

555us.net is a web application that functions as a US ZIP code and postal code lookup tool. Users select a State, then a City or County, and the tool returns the ZIP Code, FIPS Code, Area Code, Time Zone, and an interactive map for that location. The raw HTML also contains a large static text block (ZIP code history, definitions, and an international postal-code glossary), most likely placed there so search engine crawlers have indexable content since the interactive tool itself is JavaScript-rendered.

Looking for a zip code, postal code, or the exact FIPS code, area code, and time zone tied to a US location? 555US is a free zip code generator that gives you accurate, up-to-date US postal data in seconds. Just pick a state, then a city or county, and 555US instantly returns everything you need — including an interactive map of the exact location. No downloads. No sign-up. No cost. Just fast, reliable US zip code lookup. [ Find My ZIP Code Now → ]

What is ZIP Code

The term ZIP code is used to refer to a system of postal codes that are used by the United States Postal Service (USPS) since the early 1963. The term ZIP, which is an acronym for the "Zone Improvement Plan", is always properly written in capital letters and was selected to suggest that the mail travels more correctly and efficiently, and therefore more quickly, when the senders make use of the code that is in the postal address.

The basic format of a ZIP code is made up of five decimal numerical digits. An extended ZIP+4 are codes that was introduced in the late 1980s, which includes the five digits of the ZIP code, a hyphen(-), and four extra digits that would denote a more precise location than you can get when using the ZIP code alone. The word ZIP code was primarily registered as a servicemark (which is a kind of trademark) of the United States. Postal Service, but their registration has long since expired.

ZIP codes shows only delivery points that are within the United States and their dependencies, as well as the locations of their armed forces. There are no ZIP codes that are kept as reserve for sending out mail that are bound for foreign destinations and therefore, international mails should not have a ZIP code written in their delivery address. It is Important to note that the last line of a foreign address must only show the name of the country that it is to be delivered to.

What is Postal Code

A postal code is a list of letters or numbers or letters and numbers joined together, sometimes thy would include spaces and punctuations that is included in a postal address for the sole purpose of sorting out the mail.

On February 2005, 117 countries out of the 190 member countries of the Universal Postal Union had their own postal code systems.

The development of postal codes shows clearly the increasing complexity of postal delivery as the population grew and the built environment keep getting more complex. This happened first in large cities. Postal codes began with regular postal district numbers (or postal zone numbers) within large cities. London was first that was subdivided into 10 districts in 1857 and Liverpool in was also subdivided in 1864. By the fall of World War I, such postal district or zone numbers existed in several large European cities and they existed in the USA at least in the early 1920s, implemented at the local post office level only.

By 1930 or before then, the idea of further extending postal district or zone numbering plans goes beyond large cities to cover even smaller towns and rural locales was in the air. These developed to become postal codes as they are defined today. The name of US postal codes, which is "ZIP codes", reflects this evolutionary growth from a zone plan to a zone improvement plan, shortened to as ZIP. Modern postal codes was the first to be introduced in the Ukrainian Soviet Socialist Republic by December 1932, but the system was abandoned by the start of 1939.

Terms Used in ZIP Code or Postal Code:

CAP: This is the standard word in Italy; CAP stands as the acronym for Codice di Avviamento Postale (which means "postal expedition code").
CEP: This is the standard word in Brazil; CEP is the acronym for the Código de Endereçamento Postal (which means "postal addressing code").
Eircode: This is the standard term of ZIP in Ireland.
NPA in the French speaking Switzerland citizens (numéro postal d'acheminement) and the Italian-speaking Switzerland (numero postale di avviamento).
PIN: This is the standard term in India; PIN is the acronym for Postal Index Number. Sometimes redundantly refered to as a PIN code.
PLZ: The standard term in Austria, Germany, German-speaking Switzerland and Liechtenstein; PLZ is an abbreviation of the word "Postleitzahl" which means postal routing number.
Postal code: This is the general word that is used in Canada.
Postcode: This word is popular in almost all the English-speaking countries in the world and it is also the standard term in the Netherlands and in African countries.
PSČ: This is the standard term in Slovakia and Czech Republic; PSČ is the acronym for the Poštové smerovacie číslo (in Slovak) or Poštovní směrovací číslo (in Czech), both of them meaning the postal routing number.
ZIP code: This is the standard term in the United States and in the Philippines; ZIP is the acronym for the Zone Improvement Plan.

How To Find US ZIP code

It’s not very difficult to find US ZIP Code or US Postcode. The most definite requirement is the proper location name such US State, City or County you want to find, then locate 555us.net to start searching by simply selecting State or City or County as preferred. Moreover, it’s also possible to find it out by clicking the specific point on the map showing on the result box.

Select a State: Choose the US state you're searching in from the dropdown menu.
Select a City or County: A state alone isn't enough — most states contain dozens or hundreds of individual zip codes, so narrow your search to the specific city or county.
View Your Results: 555US instantly displays the zip code, postal code, FIPS code, area code, time zone, and an interactive map for that location.

However, searching for the ZIP Code with a state only might not help you, as a state encompasses multiple City ZIP Codes. You have to select state and then select corresponding city or county for accurate result. To Start your search, click here >> US ZIP Code or US Postal Code

Nonetheless, if you are searching for a place other than in the United States, you must check with the correct postal code or zip code in that country.

Features: Why People Use 555US

Most zip code tools give you a five-digit number and nothing else. 555US goes further. A single search on 555US returns:

State — the full US state name tied to your search
County — the county your city or zip code falls within
City — matched cities for the zip code or area you're searching
ZIP Code — the standard 5-digit USPS ZIP Code
FIPS Code — the Federal Information Processing Standard code used by government agencies, the Census Bureau, and data systems for that county or state
Area Code — the telephone area code(s) that serve that location
Time Zone — so you always know what time it is at that address, whether you're scheduling a call or shipping a package
Interactive Map — a visual, clickable map pinpointing the exact location, so you can confirm you've got the right place before you use the code

This "one search, everything you need" approach is what makes 555US different from a basic zip code list. Whether you're filling out a shipping label, verifying a customer's address, doing market research by county, or just curious what area code covers a small town in Oregon, 555US gives you the complete picture in one place.

Frequently Asked Questions

Is 555US free to use?

Yes. 555US is completely free — there's no account, subscription, or payment required to search for zip codes, postal codes, or the associated location data.

Do I need to know the exact city name to find a zip code?

No. You can search by state and city, or explore visually using the interactive map to click on the approximate area you're looking for.

Can one city have more than one zip code?

Yes — larger cities are frequently divided into multiple zip codes, each covering a different neighborhood or delivery zone. 555US shows you the specific codes tied to the city or area you select.

What's the difference between a 5-digit ZIP Code and a ZIP+4 code?

The standard 5-digit ZIP Code identifies a general delivery area. The ZIP+4 format adds four more digits after a hyphen to narrow that down to a much more specific location, which speeds up mail sorting and delivery for high-volume senders.

What is a FIPS code, and why does 555US show it?

A FIPS (Federal Information Processing Standard) code is a standardized numeric identifier the U.S. government uses for states and counties — commonly used in census data, government datasets, and data analysis. 555US includes it alongside your zip code lookup so the data is useful for research and reporting, not just mailing.

Does 555US work for finding zip codes outside the United States?

No — 555US is built specifically for United States ZIP Codes. If you need a postal code for another country, contact that country's national postal authority.

Can I find the area code and time zone for a location using 555US?

Yes. Along with the ZIP Code, 555US displays the matching area code(s) and time zone for the state, county, or city you search.

Common Uses for a Zip Code Lookup Tool

Shipping and mailing — confirm the correct zip code before sending a package or letter, especially to unfamiliar addresses.
E-commerce and checkout forms — verify a customer-entered zip code matches their stated city and state to reduce shipping errors.
Market research — look up zip codes and FIPS codes by county to align with census and demographic data.
Scheduling across time zones — quickly confirm what time zone a business or contact is in before setting up a call.
Real estate and relocation research — explore the zip codes, counties, and area codes tied to a neighborhood you're considering moving to.
Data entry and address verification — cross-check zip codes against city/state pairs to catch typos or invalid addresses before they cause delivery failures.

Start Your US Zip Code Search

Whether you need a single zip code or you're comparing postal data across states, 555US puts accurate US Zip Code, Postal Code, FIPS Code, Area Code, Time Zone, and map data in one simple, free search.

[ Search US Zip Codes Now → ]

555US ZIP Codes