Area code 734: Michigan
Area code 734 is a US state area code for Michigan, on Eastern Time. It has 700 prefixes in service across 33 rate centers, the largest being Ann Arbor, Livonia and Wayne. It shares its area with 679, so local numbers there can start with any of them. Local calls there take 7 digits.
Local time in area code 734
America/New_York
Prefixes in service
700 of 792 possible
33 rate centers
Area code 734 facts
| Location | Michigan, United States |
|---|---|
| Time zone | Eastern Time |
| Overlays | 679 |
| Split from | 313 |
| In service since | December 13, 1997 |
| Local calls | 7 digits; toll calls 1 + 10 digits |
| Carrier | Not shown. An area code is where a number was issued; numbers port between carriers. Check line type |
Which cities and towns use area code 734?
NANPA records each prefix against a rate center, the local billing area a number belongs to, usually named after its main town. These are the 734 rate centers with the most prefixes in service. 21 smaller ones aren't listed.
| Rate center | Prefixes |
|---|---|
| Ann Arbor | 133 |
| Livonia | 64 |
| Wayne | 60 |
| Ypsilanti | 52 |
| Plymouth | 43 |
| Monroe | 40 |
| Wyandotte | 39 |
| Trenton | 27 |
| Romulus | 24 |
| Dexter | 16 |
| New Boston | 16 |
| Flat Rock | 16 |
Source: NANPA central office code assignments, file dated 10/17/2026. Each prefix holds up to 10,000 numbers.
How do I dial a 734 number?
NANPA's dialling plan for 734: local calls inside the code take 7 digits, toll calls 1 + 10 digits. From another area code, dial 1 first. From abroad, use +1. The examples use 555-0147, from a range reserved for fictional numbers.
| Local call inside 734 | 555-0147 |
|---|---|
| From another US or Canadian area code | 1-734-555-0147 |
| From outside North America | +1 734 555 0147 |
| E.164, for CRMs and SMS tools | +17345550147 |
When did area code 734 start?
Area code 734 went into service on December 13, 1997, split from 313. Today 734 and 679 cover the same area as an overlay, which is why 10-digit dialling is needed for local calls there.
Tools for 734 numbers
- Area code lookup
Look up any code or a whole list of numbers, or find the codes for a state or city.
- Area code time zone
Local time for a list of numbers, with a callable-now flag.
- NPA-NXX lookup
Rate center and state for one prefix, a level below the area code.
- TCPA calling hours checker
Whether it's inside the federal 8 a.m. to 9 p.m. calling window there now.
Next step
A 734 number tells you where it was issued, not what it is now.
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Area code 734 questions
- What state is area code 734?
- Area code 734 is in Michigan, United States. Its largest rate centers by number of prefixes are Ann Arbor, Livonia, Wayne, Ypsilanti and Plymouth.
- What time zone is area code 734 in?
- Eastern Time.
- What area codes overlay 734?
- 679. An overlay adds a new code to the same area instead of splitting it, so neighbours can have different area codes and local calls need 10 digits.
- When did area code 734 start?
- Area code 734 went into service on December 13, 1997, split from 313.
- Is a 734 number a cell phone or a landline?
- The area code can't tell you. In the US and Canada mobiles, landlines and VoIP lines share area codes and prefixes, and numbers move between carriers and line types. Only a live line-type lookup answers it for one number.
- How many phone numbers does area code 734 have?
- 700 of its 792 possible prefixes are in service, and each prefix holds up to 10,000 numbers. That counts prefixes assigned to carriers, not numbers in use.
Other area codes in Michigan
Sources
Location, overlays, in-service date and dialling plan: NANPA NPA database, file dated 10/16/2026. Prefixes and rate centers: NANPA central office code assignments, 10/17/2026. Time zones mapped to the IANA time zone database. By the SimpleVerifier Team; how we build these pages.