Get a local business phone number in Warrenton, MO

Warrenton area codes

Warrenton, in Warren County, Missouri, had a Census-estimated population of 9,420 in July 2024. All 10 exchanges NANPA lists for its rate center are in area code 636. Warrenton is in the Central time zone.

According to NANPA's dialing-plan data, local calls within 636 are dialed as seven digits and toll calls as 1 plus ten digits.

Phone carriers in Warrenton

7 carriers hold the 10 exchanges assigned to Warrenton's rate center. New Cingular Wireless PCS, LLC - Il has the most, with 2. 9 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.

Exchanges (NPA-NXX) assigned in Warrenton

Each prefix below is a block of up to 10,000 numbers that NANPA assigned to Warrenton's rate center (WARRENTON). The earliest assignment date recorded in the file for these codes is 2002. 4 of the 10 were assigned in 2020 or later.

When Warrenton's exchanges were assigned

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

How local numbers work in Warrenton

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

New local numbers are drawn from carrier inventory, so the exact 636 numbers available change over time; porting an existing number is free.

The local business market

Warrenton is part of the St. Louis, MO-IL metro area, home to 2.8 million people in 2024. County Business Patterns counted 69,470 business establishments in the St. Louis, MO-IL metro area in 2023, employing 1,263,674 people. The largest sectors by establishment count are health care and social assistance (10,427), retail trade (8,095), and professional, scientific, and technical services (7,057).

Setting up a Warrenton business line

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 Warrenton, 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.

The comparison below uses 18 users, the rounded average establishment size in the St. Louis, MO-IL metro area. At list prices checked September 28, 2026, that is $449.10 a month on Ooma Office Pro and $540.00 on RingCentral RingEX Core. On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.