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United States Postal Codes & Phone Area Query

Welcome to the United States Postal Codes and Phone Generator directory. This portal indexes 49 major states/provinces in United States. Select a region to explore local cities, street zip codes, neighborhood maps, and to generate simulated phone numbers conforming to local telecommunication network rules for QA and development.

United States Country Code
49 Indexed States
7 Active Languages
🔍 Showing 49 states

Available States

49
Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

Frequently Asked Questions

Postal Code System
In the United States, postal codes are known as ZIP Codes, introduced by the USPS in 1963. The standard ZIP Code is a 5-digit sequence (e.g. 10012) designating specific regional hubs or delivery offices. A 9-digit extension, known as ZIP+4, is also supported to pinpoint exact street segments, apartment complexes, or mailing boxes for accelerated delivery sorting.
Dialing Format & Area Codes
US phone numbers adhere to the North American Numbering Plan (NANP), utilizing a standard 10-digit format: a 3-digit Area Code followed by a 7-digit local subscriber number. Our platform indexes genuine area codes for major US cities and provides mock phone numbers following local telecom guidelines to assist software QA testing.
What is the length and format of postal codes in United States?
ZIP Codes in the United States use a 5-digit basic format (e.g., 10012), where the first three digits represent a sectional center facility and the last two represent a local delivery area. An extended 9-digit format, ZIP+4, is also supported for precise delivery to blocks or buildings.
How are telephone area codes structured and allocated in United States?
United States phone numbers belong to the North American Numbering Plan (NANP), using a standard 10-digit format (3-digit area code + 7-digit subscriber number). States are assigned multiple area codes, and overlay codes are common in major cities.
How do you dial a United States phone number from abroad?
To call the US from abroad, dial the international prefix (like '+' or '00'), followed by the country code '1', and then the 10-digit number (3-digit area code + 7-digit subscriber number). Example: +1 212 555 0199.
Do postal codes and telephone area codes in United States align geographically?
No, postal codes and telephone area codes are independently planned and managed by different authorities (the postal service vs. the telecom authority), so their geographic boundaries do not align directly. One area code usually contains hundreds or thousands of postal codes.
Why is the correct postal code critical for mail and package delivery in United States?
The correct postal code is the core basis for modern logistics and automated postal sorting. Writing the correct postal code avoids misrouting, reduces sorting steps, shortens delivery times, and ensures precise delivery to specific blocks or buildings.
How can I verify if a United States postal code or telephone area code is valid?
You can use the directory hierarchy on our website to browse states, cities, and districts to check the postal code and area code mapping. For official confirmation, you can consult the official postal service or telecom authority of that country.