Free ZIP Code Finder & Lookup Tools
Find a US ZIP code by city, state, county, or address. Use our ZIP Code Lookup, ZIP Code Distance, ZIP+4, ZIP Code Map, timezone, coordinate, and radius tools — all free, fast, and available without signup.
ToolTrio brings related US ZIP-code utilities together in one place — from everyday ZIP lookup and ZIP Code Finder searches to ZIP+4, ZIP distance, maps, time zones, coordinates, and ZIPs within a radius. Choose the tool that matches your task.
Explore ZIP Code Tools by Task
⭐ Popular ZIP Code Searches
Common ZIP-code tasks, with clear names that take you directly to the right tool.
📮 All ZIP Code Tools
Each card uses a natural search-friendly description while linking to its canonical ToolTrio page.
📚 ZIP Code Guides
Practical guides for ZIP lookup, ZIP+4, distance, timezones, coordinates and more.
Mountain Time ZIP Codes: States, Examples & Lookup
List ZIP codes for Mountain Time, understand MST vs MDT, check split-state areas, and find the exact time zone for a ZIP code.
ZIP Codes by Time Zone: Eastern, Central, Mountain & Pacific
Compare Eastern, Central, Mountain, and Pacific Time, understand split-state and daylight-saving exceptions, and verify individual ZIP codes.
Eastern Time ZIP Codes: States, Examples & Lookup
Learn how Eastern Time ZIP codes work, where Eastern and Central boundaries cause confusion, how EST differs from EDT, and how to verify a ZIP.
Central Time ZIP Codes: States, Examples & Lookup
Explore Central Time ZIP coverage, split-state boundaries, CST versus CDT, sample ZIPs, and a reliable ZIP-level verification workflow.
Pacific Time ZIP Codes: States, Examples & Lookup
Understand Pacific Time ZIP coverage, eastern Oregon and other boundary areas, PST/PDT offsets, sample ZIPs, and lookup accuracy.
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.
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 focused on US ZIP code 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?
ToolTrio provides US ZIP code tools covering lookup, distance, ZIP+4, timezone, coordinates and radius searches.