CallataGuidesGet a local business phone number in Knoxville, IA
Knoxville's area code, prefixes and carriers from NANPA records, and how to put a Knoxville number in front of your customers.
- Area code
- 641
- Exchanges
- 8NANPA-assigned
- Carriers
- 5
- Population
- 7,440Census 2024 est.
Area codes in Knoxville
With 7,440 residents in the Census 2024 estimate, Knoxville sits in Marion County, Iowa. All 8 exchanges NANPA lists for its rate center are in area code 641. Knoxville is in the Central time zone.
According to NANPA's dialing-plan data, local calls within 641 are dialed as seven digits and toll calls as 1 plus ten digits.
| Area code | Exchanges here | Share | In service since | Overlay with | Time zone |
|---|---|---|---|---|---|
| 641 | 8 | 100% | 2000 | none | Central |
Source: NANPA utilized central office code file and NPA report, dated 10/01/2026.
Phone carriers in Knoxville
5 carriers hold the 8 exchanges assigned to Knoxville's rate center. United States Cellular - Ia has the most, with 2. 6 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.
| Carrier (NANPA operating company) | Exchanges | Share |
|---|---|---|
| United States Cellular - Ia | 2 | 25% |
| Cellco Partnership d/b/a Verizon Wireless - Ia | 2 | 25% |
| Windstream Iowa Communications, INC. | 2 | 25% |
| Local Telephone Data Services Corp. | 1 | 13% |
| T-mobile USA, INC. | 1 | 13% |
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 Knoxville
A prefix (NXX) is the three digits after the area code. Numbers starting with these prefixes are rated as local to Knoxville. None were assigned in 2020 or later.
| Area code | Prefixes (NXX) |
|---|---|
| 641 | 205, 218, 318, 820, 828, 842, 871, 891 |
Source: NANPA utilized central office code file.
What makes a number local to Knoxville
What a caller sees as "local" is the area code plus prefix. In Knoxville, those come from the KNOXVILLE rate center, as recorded by NANPA.
New local numbers are drawn from carrier inventory, so the exact 641 numbers available change over time; porting an existing number is free.
The local business market
Knoxville is part of the Pella, IA micropolitan area, home to 34,048 people in 2024. County Business Patterns counted 859 business establishments in the Pella, IA micropolitan area in 2023, employing 17,934 people. The largest sectors by establishment count are retail trade (124), health care and social assistance (102), and other services (except public administration) (100).
| Industry | Establishments | Employees | Employees per establishment |
|---|---|---|---|
| Limited-service restaurants | 27 | 542 | 20.1 |
| Full-service restaurants | 23 | 346 | 15.0 |
| Residential remodelers | 14 | 18 | 1.3 |
| Landscaping services | 13 | 50 | 3.8 |
| Law offices | 12 | — | — |
| Chiropractic offices | 11 | — | — |
| Offices of real estate agents and brokers | 11 | — | — |
| Physician practices | 10 | — | — |
Selected small-business industries (six-digit NAICS) covered by these guides. Source: Census County Business Patterns 2023.
Business phone service in Knoxville
Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.
Porting a number you already use in Knoxville 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.
Per-seat phone plans multiply by headcount. For the rounded average establishment size in the Pella, IA micropolitan area, 21 users on RingCentral RingEX Core come to $630.00 a month and on Ooma Office Pro $523.95, at month-to-month list prices checked September 28, 2026. Callata comes to $419.00 a month for 21 users ($99 a month with 5 users included, then $20 per additional user), below both.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $419.00 | $5,028.00 |
| Quo (Starter) | $19.00 per user | $399.00 | $4,788.00 |
| Nextiva (Core) | $23.00 per user | $483.00 | $5,796.00 |
| Ooma (Office Pro) | $24.95 per user | $523.95 | $6,287.40 |
| Dialpad (Standard) | $27.00 per user | $567.00 | $6,804.00 |
| RingCentral (RingEX Core) | $30.00 per user | $630.00 | $7,560.00 |
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 Knoxville, IA?
641. All exchanges NANPA lists for Knoxville are in 641.
How many phone companies have exchanges in Knoxville?
5, holding 8 exchanges between them, according to NANPA's 10/01/2026 file.
Can I keep my existing Knoxville 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 Knoxville?
Callata is $99 a month with 5 users included, then $20 per additional user, with up to 3 local numbers; 21 users come to $419.00 a month. For comparison, 21 users on RingCentral RingEX Core list at $630.00 a month (checked September 28, 2026).