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Get a local business phone number in Romulus, MI

Romulus's area code, prefixes and carriers from NANPA records, and how to put a Romulus number in front of your customers.

Area code
734
Exchanges
24NANPA-assigned
Carriers
11
Population
24,652Census 2024 est.

Area codes in Romulus

Romulus, in Wayne County, Michigan, had a Census-estimated population of 24,652 in July 2024. All 24 exchanges NANPA lists for its rate center are in area code 734. 734 is part of an overlay with 679, so a new local number in Romulus may carry any of those codes depending on which have numbers available. Romulus is in the Eastern time zone.

According to NANPA's dialing-plan data, local calls within 734 are dialed as seven digits and toll calls as 1 plus ten digits.

Area codes with exchanges in Romulus, MI
Area codeExchanges hereShareIn service sinceOverlay withTime zone
73424100%1997679Eastern

Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.

Who holds Romulus phone exchanges

11 carriers hold the 24 exchanges assigned to Romulus's rate center. Michigan Bell Tel CO has the most, with 8. 19 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. A business number in Romulus can come from any of these blocks; once it is yours, porting lets it move between providers.

Carriers holding exchanges in Romulus, MI
Carrier (NANPA operating company)ExchangesShare
Michigan Bell Tel CO833%
Mcimetro Access Transmission Services LLC - Mi417%
Paetec Itel, LLC28.3%
Level 3 Communications, LLC - Mi28.3%
Teleport Communications America, LLC - Mi28.3%
American Messaging Services, LLC14.2%
Spok, INC.14.2%
New Cingular Wireless PCS, LLC - Il14.2%
Fractel, LLC14.2%
Cellco Partnership d/b/a Verizon Wireless - Mi14.2%
Comcast Ip Phone, LLC14.2%

Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.

Local prefixes for Romulus

A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Romulus. The earliest assignment date recorded in the file for these codes is 2001. 1 of the 24 were assigned in 2020 or later.

Prefixes assigned in Romulus, MI
Area codePrefixes (NXX)
734229, 247, 267, 380, 403, 406, 413, 442, 494, 499, 532, 685, 784, 840, 857, 893, 921, 939, 941, 942, 946, 947, 955, 992

Source: NANPA utilized central office code file.

When Romulus's exchanges were assigned

Assignment dates show when each block of Romulus numbers was added to the local supply.

Romulus, MI: exchanges by decade assigned
Decade assignedExchangesShare
2000s120%
2010s360%
2020s120%

Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.

Rate centers and local calling in Romulus

NANPA ties every exchange to a rate center. For Romulus that is ROMULUS, so a number from one of these exchanges reads as local to people in and around Romulus.

Keeping an existing Romulus number costs nothing on Callata, because porting is free; a new number depends on what carriers have open in 734 when you pick it.

Who does business near Romulus

Romulus is part of the Detroit-Warren-Dearborn, MI metro area, home to 4.4 million people in 2024. County Business Patterns counted 102,430 business establishments in the Detroit, MI metro area in 2023, employing 1,846,717 people. The largest sectors by establishment count are retail trade (14,016), health care and social assistance (13,890), and professional, scientific, and technical services (11,783).

Selected industries in the Detroit, MI metro area, 2023
IndustryEstablishmentsEmployeesEmployees per establishment
Limited-service restaurants3,76463,82117.0
Physician practices3,62245,65712.6
Full-service restaurants3,19165,66920.6
Law offices2,13015,5657.3
Dental offices1,92116,1278.4
Landscaping services1,7118,2614.8
Residential remodelers1,6215,9243.7
Insurance agencies and brokerages1,52011,5697.6

Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.

A Romulus number on Callata

For $99 a month, Callata puts a team of up to 5 on one plan ($20 for each person after that): up to 3 local numbers, unlimited inbound calls, a pooled allowance of 1,500 outbound US and Canada minutes per user, browser and cell calling, voicemail transcription with urgency triage, recorded calls with AI summaries and business-hours routing, with E911 on every number.

If you already have a number in Romulus, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.

Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.

An 18-person team is the benchmark here, the rounded average establishment size in the Detroit, MI metro area. Billed per seat at month-to-month list prices (checked September 28, 2026), RingCentral RingEX Core costs $540.00 a month and Ooma Office Pro $449.10. On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.

Monthly list price for an 18-person team
Provider (plan)Pricing basisPer monthPer year
Callata (Callata Office)$99 incl. 5 users, $20 per extra user$359.00$4,308.00
Quo (Starter)$19.00 per user$342.00$4,104.00
Nextiva (Core)$23.00 per user$414.00$4,968.00
Ooma (Office Pro)$24.95 per user$449.10$5,389.20
Dialpad (Standard)$27.00 per user$486.00$5,832.00
RingCentral (RingEX Core)$30.00 per user$540.00$6,480.00

Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.

Frequently asked questions

What area code is Romulus, MI?

734. All exchanges NANPA lists for Romulus are in 734.

How many phone companies have exchanges in Romulus?

11, holding 24 exchanges between them, according to NANPA's 10/01/2026 file.

Can I keep my existing Romulus business number?

Yes. Porting an existing number to Callata is free. Texting from it starts after carrier registration (10DLC), a one-time $49 fee.

How much is a business phone line in Romulus?

Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 18 users come to $359.00 a month. For comparison, 18 users on RingCentral RingEX Core list at $540.00 a month (checked September 28, 2026).