How accurate is ZIP code to time zone mapping?

This tool is highly accurate for the vast majority of US ZIP codes. It uses ZIP code range data cross referenced with official state time zone data. The only edge cases are ZIP codes in counties split between two time zones, such as certain counties in Indiana, Kentucky, Tennessee, or Florida. In those cases, the tool returns the dominant time zone for the state or region.

Which states are split across two time zones?

Several US states span two time zones: Florida, Indiana, Kentucky, Tennessee, and Michigan split between Eastern and Central; Kansas, Nebraska, North Dakota, South Dakota, and Texas split between Central and Mountain; Idaho, Oregon, and Nevada split between Mountain and Pacific; and Alaska spans Alaska Time and Hawaii Aleutian Time.

When does Daylight Saving Time start and end in the US?

In the United States, Daylight Saving Time begins on the second Sunday of March at 2:00 AM, when clocks spring forward one hour, and ends on the first Sunday of November at 2:00 AM, when clocks fall back one hour. This applies to all states except Arizona and Hawaii, and all territories except Puerto Rico, Guam, US Virgin Islands, American Samoa, and the Northern Mariana Islands.

Does this tool work for Canadian or international postal codes?

No. This tool is designed specifically for US ZIP codes in 5 digit numeric format. Canadian postal codes use a different alphanumeric format and are not supported. International time zone lookups need a separate tool using city or country based data.

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ZIP Code to Time Zone Converter

Enter any US ZIP code to instantly find its time zone, current local time, UTC offset, and daylight saving time status.

🇺🇸 All 50 States ⏱ Live Clock 📋 Bulk Lookup 🌙 DST Aware

Reviewed: June 2026

By CalcMora Editorial Team

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Single ZIP Code Lookup

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Bulk ZIP Code Lookup

Enter multiple ZIP codes separated by commas, spaces, or new lines.

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US Time Zone Quick Reference

Eastern Time

UTC−5 (EST) / UTC−4 (EDT)

NY, FL, GA, PA, OH, MI, NC, SC, VA, WV, IN (most), KY (east), TN (east), ME, NH, VT, MA, RI, CT, NJ, DE, MD, DC

Central Time

UTC−6 (CST) / UTC−5 (CDT)

TX (most), IL, WI, MN, IA, MO, AR, LA, MS, AL, OK, KS (most), IN (NW/SW), KY (west), TN (most), SD (east), ND (most), NE (most)

Mountain Time

UTC−7 (MST) / UTC−6 (MDT)

AZ (no DST), CO, UT, NM, WY, MT, ID (most), SD (west), ND (west), NE (panhandle), KS (west), TX (El Paso), NV (W. Wendover)

Pacific Time

UTC−8 (PST) / UTC−7 (PDT)

CA, WA, OR (most), NV (most), ID (north of Salmon River)

Alaska Time

AKT

UTC−9 (AKST) / UTC−8 (AKDT)

Alaska (most of state)

Hawaii–Aleutian Time

UTC−10 (no DST in Hawaii)

Hawaii, Aleutian Islands (AK)

Free to use

No signup required

Regularly updated

100% private — no data stored

How to Use This Tool

Enter a ZIP Code

Type any valid 5-digit US ZIP code into the input field above. For example, try 10001 (New York) or 90210 (Beverly Hills).

Click "Find Time Zone"

Hit the button or press Enter. Results appear instantly — no page reload needed. The tool works entirely in your browser.

Read Your Results

See the time zone abbreviation, full name, live local time, UTC offset, DST status, state name, and IANA timezone identifier.

Use Bulk Lookup

Need to check many ZIP codes at once? Use the Bulk Lookup section. Paste dozens of ZIPs separated by commas or new lines.

What Is a ZIP Code Time Zone?

Every US ZIP code belongs to a specific geographic area, and each area falls within one of the official US time zones. The United States spans six main time zones: Eastern (ET), Central (CT), Mountain (MT), Pacific (PT), Alaska (AKT), and Hawaii–Aleutian (HT). Some states like Florida, Indiana, Kentucky, and Tennessee are split between two time zones — making a reliable ZIP-to-timezone lookup especially useful.

A ZIP code to time zone lookup is useful for businesses scheduling meetings across states, developers building scheduling software, e-commerce stores showing correct delivery times, and anyone coordinating with people in a different part of the country.

How ZIP Codes Map to Time Zones

ZIP codes were created by the US Postal Service for mail delivery — not for geographic or time zone accuracy. However, because ZIP codes are assigned by region, each ZIP code range corresponds reliably to a US state, and most states fall entirely within a single time zone.

This tool uses ZIP code range data per state combined with official time zone reference data to determine the correct time zone for any given ZIP. For states split across time zones — like Indiana, Tennessee, Kentucky, and Florida — the tool applies the dominant or most common time zone for that state's ZIP range.

Daylight Saving Time (DST) by State

Most US states observe Daylight Saving Time (DST), moving clocks forward 1 hour in spring and back in fall. However, Arizona (except the Navajo Nation) and Hawaii do not observe DST. US territories like Puerto Rico, Guam, the US Virgin Islands, American Samoa, and the Northern Mariana Islands also do not observe DST.

This tool accurately reflects DST status for each ZIP code so you always see the correct current local time — whether it is standard time or daylight saving time.

Common Use Cases

📞 Call centers: Know when customers are available before calling
📅 Meeting scheduling: Avoid accidentally booking a 6 AM meeting for someone in California
🛒 E-commerce: Show accurate same-day shipping cutoff times by ZIP
💻 Developers: Map user ZIP codes to IANA timezone IDs for apps
📦 Logistics: Coordinate delivery windows across multiple states
📰 Media/publishing: Schedule content releases for specific time zones
🧑‍💼 Remote teams: Quickly check a colleague's local time by ZIP

Popular ZIP Code Examples

ZIP Code	City / Area	State	Time Zone	UTC Offset	DST
10001	New York City	NY	Eastern (ET)	UTC−5 / UTC−4	Yes
90210	Beverly Hills	CA	Pacific (PT)	UTC−8 / UTC−7	Yes
60601	Chicago	IL	Central (CT)	UTC−6 / UTC−5	Yes
77001	Houston	TX	Central (CT)	UTC−6 / UTC−5	Yes
85001	Phoenix	AZ	Mountain (MT)	UTC−7 (no DST)	No
98101	Seattle	WA	Pacific (PT)	UTC−8 / UTC−7	Yes
33101	Miami	FL	Eastern (ET)	UTC−5 / UTC−4	Yes
80201	Denver	CO	Mountain (MT)	UTC−7 / UTC−6	Yes
30301	Atlanta	GA	Eastern (ET)	UTC−5 / UTC−4	Yes
99501	Anchorage	AK	Alaska (AKT)	UTC−9 / UTC−8	Yes
96701	Aiea, Hawaii	HI	Hawaii (HT)	UTC−10	No
73301	Austin (TX IRS)	TX	Central (CT)	UTC−6 / UTC−5	Yes

Frequently Asked Questions

This tool is highly accurate for the vast majority of US ZIP codes. It uses ZIP code range data cross-referenced with official state time zone data. The only edge cases are ZIP codes in counties that are split between two time zones (such as certain counties in Indiana, Kentucky, Tennessee, or Florida). In those cases, the tool returns the dominant time zone for the state or region.

Arizona opted out of Daylight Saving Time under the Uniform Time Act of 1967. The state legislature decided that adding an extra hour of evening sunlight in an already hot desert climate was not beneficial. Arizona permanently observes Mountain Standard Time (MST, UTC−7). Note: the Navajo Nation within Arizona does observe DST.

Several US states span two time zones: Florida (Eastern and Central), Indiana (Eastern and Central), Kentucky (Eastern and Central), Tennessee (Eastern and Central), Michigan (Eastern and Central), Kansas (Central and Mountain), Nebraska (Central and Mountain), North Dakota (Central and Mountain), South Dakota (Central and Mountain), Texas (Central and Mountain), Idaho (Mountain and Pacific), Oregon (Mountain and Pacific), Nevada (Mountain and Pacific), and Alaska (Alaska and Hawaii–Aleutian).

An IANA (Internet Assigned Numbers Authority) time zone ID is a standardized string used by software systems to identify a time zone. For example, America/New_York for Eastern Time, America/Chicago for Central Time, America/Denver for Mountain Time, and America/Los_Angeles for Pacific Time. These IDs automatically handle DST transitions and are used in programming languages, databases, and APIs worldwide.

In the United States, Daylight Saving Time (DST) begins on the second Sunday of March at 2:00 AM (clocks spring forward 1 hour) and ends on the first Sunday of November at 2:00 AM (clocks fall back 1 hour). This applies to all states except Arizona and Hawaii, and all territories except Puerto Rico, Guam, US Virgin Islands, American Samoa, and Northern Mariana Islands.

Yes. This tool covers ZIP codes for US territories including Puerto Rico (ZIP 00600–00988, Atlantic Time UTC−4, no DST), Guam (ZIP 96910–96932, Chamorro Time UTC+10, no DST), US Virgin Islands (ZIP 00801–00805, Atlantic Time UTC−4, no DST), American Samoa (ZIP 96799, Samoa Time UTC−11, no DST), and Northern Mariana Islands (ZIP 96950–96952, Chamorro Time UTC+10, no DST).

No. This tool is designed specifically for US ZIP codes (5-digit numeric format). Canadian postal codes use a different alphanumeric format (e.g., M5V 3A8) and are not supported. For international time zone lookups, you would need a separate tool using city or country-based data.

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Disclaimer

This tool is for educational purposes only. Always verify important results with a qualified professional.

Mizan

Founder, CalcMora

Building a growing library of free calculators to help people make smarter everyday decisions.

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