Free US ZIP Code Lookup, Distance, Timezone & ZIP+4
Find a US ZIP code, measure distance between ZIP codes, identify a ZIP code's timezone, get ZIP coordinates, or look up ZIP+4 information. These five ZIP tools are the core of ToolTrio's location toolkit — free, fast and available without signup.
Look up city, state, county and timezone; calculate ZIP-to-ZIP distance; find ZIP+4 information; get latitude and longitude coordinates; or identify the timezone for a ZIP code. All five tools are free to use.
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📮 Free ZIP Code Tools
View all 35+ ZIP code tools →Look up any US ZIP code, find your ZIP+4 extension, calculate the distance between ZIP codes, or convert a ZIP to its timezone — instant results for every ZIP code cluster in the US.
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📮 All ZIP Code Tools
View all ZIP code tools →📚 ZIP Code Guides
Practical guides for ZIP lookup, ZIP+4, distance, timezones, coordinates and more.
What Is a ZIP+4 Code? The Extra 4 Digits Explained
ZIP+4 adds four digits to your 5-digit ZIP to pinpoint an exact delivery point — here is what it means, why USPS uses it, and how to find yours.
How to Find a ZIP Code From an Address
Have a street address but no ZIP? Here are the fastest ways to find the correct ZIP code — including exact edge cases like new construction and rural routes.
How to Find ZIP Codes Within a Radius
Need every ZIP code within 10, 25 or 50 miles of a location? Here is how radius-based ZIP search works and where it is used in real business workflows.
How Far Apart Are Two ZIP Codes? Distance Explained
Calculating the distance between two ZIP codes takes seconds — here is exactly how it is measured, and when straight-line distance is (and is not) the right number to use.
How Many ZIP Codes Are in the United States?
USPS puts the official count at 41,554 ZIP Codes — here is the real breakdown by type, why the number shifts, and why third-party databases sometimes report a different total.
Which State Has the Most ZIP Codes?
Texas and California consistently rank as the top two states by ZIP code count — here is the full ranking, why they lead, and why exact counts vary by data source.
😄 Fun Tools
View all fun tools →Free ZIP Code Tools & Calculators — Built for Real Lookups
📮 ZIP Code Lookup — Every US ZIP Cluster
Our free ZIP code lookup tool covers every ZIP code cluster across all 50 states plus DC. Enter any 5-digit ZIP to instantly see the city, state, county, population, timezone and area code.
➕ ZIP+4 Lookup
Need the exact 4-digit extension for mail delivery? Our ZIP+4 lookup tool resolves your base ZIP instantly, then routes you to the official USPS lookup to confirm the exact +4 suffix for your street address.
📏 ZIP Code Distance Calculator
Compare any two US ZIP codes with our ZIP code distance calculator, which returns the straight-line distance in miles and kilometers — useful for shipping, delivery radius and travel planning.
🕐 ZIP Code Timezone Finder
Scheduling a call or delivery across states? Our ZIP to timezone tool instantly returns the correct US timezone for any ZIP code, including Eastern, Central, Mountain, Pacific, Alaska and Hawaii.
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Frequently Asked Questions
What is ToolTrio?
ToolTrio is a free online tools website with 35+ US ZIP code tools and fun tools. No signup required.
How do I find the city and state for a ZIP code?
Enter any 5-digit US ZIP code into the ZIP Code Lookup tool to instantly see its city, state, county, population, timezone and area code — covering every ZIP code cluster in all 50 states plus DC.
What is a ZIP+4 code?
A ZIP+4 code adds four digits after your standard 5-digit ZIP to identify a specific USPS delivery segment such as a city block or building. Use the ZIP+4 Lookup tool to check your base ZIP, then confirm the exact +4 suffix via the official USPS address lookup.
How do I calculate the distance between two ZIP codes?
Enter two ZIP codes into the ZIP Code Distance calculator to get the straight-line distance in miles and kilometers, calculated from each ZIP code's coordinates.
How do I find the timezone for a ZIP code?
Enter a ZIP code into the ZIP to Timezone tool to instantly see its US timezone — Eastern, Central, Mountain, Pacific, Alaska or Hawaii — useful for scheduling calls and deliveries across states.
What public tool categories does ToolTrio offer?
Yes. ToolTrio includes 35+ US ZIP code tools and a Fun category with 42+ tools.
Is ToolTrio also called Tool Trio or Trio Tools?
Yes. ToolTrio is also searched as Tool Trio, Trio Tools, Tools Trio, Trio Tool and Toolstrio. All of these refer to ToolTrio.com.