Get a local business phone number in Hannibal, MO

What area code is Hannibal, MO?

Hannibal city is a Census place in Marion County, Missouri, with an estimated 16,809 residents in 2024. All 13 exchanges NANPA lists for its rate center are in area code 573. 573 is part of an overlay with 235, so a new local number in Hannibal may carry any of those codes depending on which have numbers available. Hannibal is in the Central time zone.

According to NANPA's dialing-plan data, local calls within 573 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits.

Who holds Hannibal phone exchanges

6 carriers hold the 13 exchanges assigned to Hannibal's rate center. Southwestern Bell has the most, with 5. 12 of them are pooled codes, which the holder shares with other carriers in blocks of 1,000 numbers. Holding a code means NANPA assigned that block of numbers to the carrier for this rate center; individual numbers may since have been ported elsewhere.

Hannibal phone prefixes

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Hannibal's rate center (HANNIBAL). The earliest assignment date recorded in the file for these codes is 2001. None were assigned in 2020 or later.

When Hannibal's exchanges were assigned

The table groups Hannibal's exchanges by the decade NANPA recorded them as assigned.

How local numbers work in Hannibal

What a caller sees as "local" is the area code plus prefix. In Hannibal, those come from the HANNIBAL rate center, as recorded by NANPA.

New local numbers are drawn from carrier inventory, so the exact 573 numbers available change over time; porting an existing number is free.

Who does business near Hannibal

Hannibal is part of the Hannibal, MO micropolitan area, home to 38,924 people in 2024. County Business Patterns counted 1,023 business establishments in the Hannibal, MO micropolitan area in 2023, employing 13,779 people. The largest sectors by establishment count are health care and social assistance (158), retail trade (154), and other services (except public administration) (120).

Setting up a Hannibal business line

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

Porting a number you already use in Hannibal is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.

The comparison below uses 13 users, the rounded average establishment size in the Hannibal, MO micropolitan area. At list prices checked September 28, 2026, that is $324.35 a month on Ooma Office Pro and $390.00 on RingCentral RingEX Core. Callata comes to $259.00 a month for 13 users ($99 a month with 5 users included, then $20 per additional user), below both.