The 865 area code serves Knoxville and the surrounding East Tennessee region. Created in 1999 when it split from 423, 865 covers the Knoxville metro, the science city of Oak Ridge, and the gateway communities to the Great Smoky Mountains.
Quick Summary of the 865 Area Code
| Area Code | 865 |
| State | Tennessee (TN) |
| Region | Knoxville & East Tennessee |
| Major Cities | Knoxville, Oak Ridge, Maryville, Alcoa, Sevierville, Farragut, Clinton |
| Time Zone | Eastern Time (ET) – EST / EDT |
| Dialing Format | 7 or 10-digit dialing |
Geographic Coverage
The 865 area code is centered on Knoxville and covers the surrounding counties of East Tennessee, including Oak Ridge to the northwest, Maryville and Alcoa to the south, Farragut to the west, Clinton to the north, and Sevierville near the entrance to the Great Smoky Mountains National Park. It sits in the Tennessee Valley between the Cumberland Plateau and the Appalachian Mountains.
Time Zone
The 865 area code observes Eastern Time (ET). Clocks follow Eastern Standard Time (UTC−5) in winter and shift to Eastern Daylight Time (UTC−4) from mid-March through early November. Because Tennessee straddles two time zones, note that eastern Tennessee runs one hour ahead of the Nashville and Memphis regions. From the West Coast, this area is three hours ahead of Pacific Time, so a 9:00 AM call in California reaches a 865 number at 12:00 PM local time.
Tip: Business hours across the 865 region generally run 9:00 AM to 5:00 PM local time, Monday through Friday.
How to Dial a 865 Number
Area code 865 is not part of an overlay, so it has traditionally allowed 7-digit local dialing. However, 10-digit dialing is now the recommended nationwide standard, and dialing the full 10-digit number (865 + the line number) always works reliably. For international callers, dial your country’s exit code, then +1 (the North American country code), then 865, followed by the seven-digit local number.
Scam Alerts for the 865 Area Code
Like every U.S. area code, 865 has been used by scammers who spoof local numbers to appear trustworthy. Residents in Knoxville, Oak Ridge, Maryville, Alcoa, Sevierville, Farragut, Clinton should stay alert to the following common tactics:
| Scam Type | What to Watch For |
|---|---|
| IRS / Tax Scams | Callers claiming you owe back taxes and threatening arrest unless you pay immediately. |
| Utility Shut-off | Fake Knoxville Utilities Board reps demanding payment to avoid disconnection. |
| Student Loan Scam | Calls offering fake loan forgiveness to University of Tennessee students for a fee. |
| Bank Fraud Alerts | Robocalls impersonating your bank about “suspicious activity” to phish account details. |
If you receive a suspicious call from a 865 number, take these steps to protect yourself:
- Do not share personal information such as Social Security numbers, bank details, or passwords over the phone.
- Hang up and verify by calling the organization back using an official number from its website.
- Report the call to the FTC at reportfraud.ftc.gov and to the Tennessee Attorney General’s Office.
- Block the number and consider registering with the National Do Not Call Registry.
Red Flag: Legitimate agencies such as the IRS, Social Security Administration, or your local utility company will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Any 865 caller making such a demand is a scammer.
History and Economy of the 865 Region
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Area code 865 was created in 1999, split from 423, to serve the Knoxville metropolitan area as East Tennessee’s population grew. The regional economy blends education, science, energy, and tourism. The University of Tennessee’s flagship campus makes Knoxville a major college town, while nearby Oak Ridge is home to Oak Ridge National Laboratory, one of the U.S. Department of Energy’s premier research facilities and a legacy of the Manhattan Project. The Tennessee Valley Authority is headquartered in downtown Knoxville, and the region draws millions of visitors each year through the Smoky Mountain gateway towns of Sevierville, Pigeon Forge, and Gatlinburg.
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Looking Up an 865 Number
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To identify an 865 caller, use a reverse phone lookup service or search the full 10-digit number online. Knoxville-area businesses, the university, and government offices list their 865 numbers publicly, so a quick search often confirms a legitimate caller. For unknown numbers, let the call go to voicemail – genuine callers usually leave a message.
Nearby & Related Area Codes
Tennessee is served by several area codes. If you are researching 865, these neighboring and overlay codes are worth knowing:
- 423 – East TN / Chattanooga & Tri-Cities
- 615 – Nashville
- 629 – Nashville overlay
- 931 – Middle TN / Clarksville
You can also browse our full directory of Tennessee area codes for more regional guides.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Tennessee:
- Kentucky – area code 502
- Virginia – area code 804
- North Carolina – area code 704
- Georgia – area code 404
- Alabama – area code 205
- Mississippi – area code 601
- Arkansas – area code 501
- Missouri – area code 314
Frequently Asked Questions
Where is the 865 area code located?
The 865 area code covers Knoxville and East Tennessee, including Oak Ridge, Maryville, Alcoa, Farragut, and Sevierville near the Great Smoky Mountains.
Does 865 have an overlay?
No. The 865 area code covers the Knoxville region on its own and currently has no overlay code.
Do I need to dial 10 digits for 865?
Because 865 has no overlay, 7-digit local dialing has historically worked, but dialing the full 10 digits is now the recommended standard and always works.
What time zone is the 865 area code in?
The 865 area code observes Eastern Time (EST/EDT), unlike the Nashville and Memphis regions which are on Central Time.
Related 865 Guides
- Is a 865 call safe? Read Is area code 865 a scam? Spam & safety guide.
- Local coverage: see the Knoxville area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.