Where is the 734 area code?

Area code 734 covers Detroit and Toledo in Michigan, Ohio, on Detroit.

What time zone is area code 734 in?

Numbers in the 734 area code sit in Detroit and Eastern Time.

Is 734 a toll-free or scam area code?

No. 734 is a geographic North American Numbering Plan area code assigned to Michigan, Ohio. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 734 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

734 area code

Where the 734 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: MI, OH
Cities covered: 2
Counties: 2
Time zone: Detroit, Eastern Time

Quick answer

Area code 734 serves Detroit and Toledo in Michigan, Ohio. It sits in Detroit and Eastern Time and covers 2 counties and about 24 ZIP codes across the metros we track. Numbers there are also dialled as 231, 248, 313, 419, 517, 567, 586, 947.

Cities in the 734 area code

Each city links to its full local profile: sales tax, housing, income and ZIP codes.

City	County	Time zone	ZIP codes
Detroit, MI	Wayne County	EST/EDT	12
Toledo, OH	Lucas County	EST/EDT	12

Related area codes

Codes that share or border the same calling area.

734 area code FAQ

The questions people ask about this code.

Where is area code 734?

734 is a geographic area code in Michigan, Ohio, covering Detroit and Toledo.

What time is it in the 734 area code?

734 observes Detroit and Eastern Time (EST/EDT).

Is 734 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.