Area code 423 calling hours: can you call now?
Area code 423 serves Chattanooga, Johnson City, and Bristol in Tennessee. It spans Central and Eastern time, so the exchange matters. Clocks move for daylight saving time in March and November.
- Debt collection: federal — Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day. Tennessee: Collectors must assume 8 a.m.–9 p.m. local time is convenient (same as federal).
- Telemarketing: federal — 8 a.m.-9 p.m. local time at the called party's location, any day. Tennessee: 8 a.m.–9 p.m. local time at the called party, any day, absent prior express permission (same as federal).
Live check: area code 423
Turn on JavaScript for the live check. The rules table below lists every window that applies to 423.
| Zone | Local time | Rule | Window |
|---|
Not checked here: consent, Do-Not-Call lists, Reg F call frequency (7 calls in 7 days), cease-communication requests or attorney representation, reassigned numbers, and whether the consumer has told you a time is inconvenient.
Calling-hour rules for 423
Hours are local time at the person you are calling. When federal and Tennessee rules differ, the narrower window governs; the live check applies every row at once.
| Rule set | Debt collection | Telemarketing |
|---|---|---|
| Federal | Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day. Every day 8:00 a.m.–9:00 p.m. 15 U.S.C. § 1692c(a)(1) · 12 CFR § 1006.6(b)(1)(i) (Regulation F) · Reg F Official Interpretation, comment 6(b)(1)(i)-2 (consumer's location) · 12 CFR § 1006.14(b)(2)
No federal Sunday or holiday ban, but a consumer's statement that a day or time is inconvenient makes calls then unlawful. The 8-9 window is a default presumption that the consumer's prior consent (given directly to the collector) or a court can override. | 8 a.m.-9 p.m. local time at the called party's location, any day. Every day 8:00 a.m.–9:00 p.m. 47 CFR § 64.1200(c)(1) (TCPA rules) · 16 CFR § 310.4(c) (Telemarketing Sales Rule)
TSR § 310.4(c) allows calls outside 8-9 with the person's prior consent; the TCPA time rule in § 64.1200(c)(1) has no consent exception for telephone solicitations as defined. |
| Tennessee | Collectors must assume 8 a.m.–9 p.m. local time is convenient (same as federal). Every day 8:00 a.m.–9:00 p.m. Tenn. Comp. R. & Regs. 0320-05-.03 Presumption only: any time known to be inconvenient is also barred. | 8 a.m.–9 p.m. local time at the called party, any day, absent prior express permission (same as federal). Every day 8:00 a.m.–9:00 p.m. Tenn. Code Ann. § 65-4-402 · Tenn. Comp. R. & Regs. 1220-04-11-.02(1)
|
Exchanges and time zones
Area code 423 spans Central and Eastern time. The exchange — the three digits after the area code — maps to a rate center, and the rate center sets the zone. Enter the number in the check above to use it; without one, the check requires the window to be open in every zone 423 covers.
Central time America/Chicago · 25 exchanges
| Rate center | County | Exchanges |
|---|---|---|
| South Pittsburg, TN | Marion | 7 |
| Pikeville, TN | Bledsoe | 6 |
| Jasper, TN | Marion | 4 |
| Whitwell, TN | Marion | 3 |
| Dunlap, TN | Sequatchie | 2 |
| Fall Creek Falls, TN | Van Buren | 2 |
| Nine Mile, TN | Bledsoe | 1 |
Eastern time America/New_York · 733 exchanges
| Rate center | County | Exchanges |
|---|---|---|
| Chattanooga, TN | Hamilton | 183 |
| Johnson City, TN | Washington | 67 |
| Bristol, TN | Sullivan | 36 |
| Cleveland, TN | Bradley | 32 |
| Kingsport, TN | Sullivan | 32 |
| Morristown, TN | Hamblen | 28 |
| Athens, TN | McMinn | 22 |
| Greeneville, TN | Greene | 20 |
| La Follette, TN | Campbell | 16 |
| Newport, TN | Cocke | 15 |
| Elizabethton, TN | Carter | 13 |
| Midway (sullivan), TN | Sullivan | 12 |
| Rogersville, TN | Hawkins | 12 |
| Blountville, TN | Sullivan | 10 |
| Benton, TN | Polk | 9 |
| Bulls Gap, TN | Hawkins | 9 |
| Charleston, TN | Bradley | 9 |
| Sweetwater, TN | Monroe | 9 |
| Dayton, TN | Rhea | 8 |
| Erwin, TN | Unicoi | 8 |
| Madisonville, TN | Monroe | 8 |
| Soddy Daisy, TN | Hamilton | 8 |
| Limestone, TN | Washington | 7 |
| Oneida, TN | Scott | 7 |
| Sneedville, TN | Hancock | 7 |
| Fall Branch, TN | Washington | 6 |
| Mountain City, TN | Johnson | 6 |
| New Tazewell, TN | Claiborne | 6 |
| Bluff City, TN | Sullivan | 5 |
| Butler, TN | Johnson | 5 |
| Copper Basin, TN | Polk | 5 |
| Cumberland Gap, TN | Claiborne | 5 |
| Englewood, TN | McMinn | 5 |
| Etowah, TN | McMinn | 5 |
| Jellico, TN | Campbell | 5 |
| Midway (washington), TN | Washington | 5 |
| Spring City, TN | Rhea | 5 |
| Church Hill, TN | Hawkins | 4 |
| Decatur, TN | Meigs | 4 |
| Georgetown, TN | — | 4 |
| Jonesboro, TN | — | 4 |
| Mosheim, TN | Greene | 4 |
| Sullivan Gardens, TN | Sullivan | 4 |
| Surgoinsville, TN | Hawkins | 4 |
| Tellico Plains, TN | Monroe | 4 |
| Baileyton, TN | Greene | 3 |
| Collegedale, TN | Hamilton | 3 |
| Fork Ridge, TN | Claiborne | 3 |
| Hampton, TN | Carter | 3 |
| Huntsville, TN | Scott | 3 |
| Ooltewah, TN | Hamilton | 3 |
| Roan Mountain, TN | Carter | 3 |
| Stoney Creek, TN | — | 3 |
| Vonore, TN | Monroe | 3 |
| Apison, TN | Hamilton | 2 |
| Ball Play, TN | — | 2 |
| Clinchport, TN | — | 2 |
| Coker Creek, TN | Monroe | 2 |
| Deer Lodge, TN | Morgan | 2 |
| Niota, TN | McMinn | 2 |
| Oakdale, TN | Morgan | 2 |
| Riceville, TN | McMinn | 2 |
| Robbins, TN | Scott | 2 |
| Sunbright, TN | Morgan | 2 |
| Wartburg, TN | Morgan | 2 |
| Petros, TN | Morgan | 1 |
| Shady Valley, TN | Johnson | 1 |
Zone not resolved
We could not pin these exchanges to one time zone; the check requires the window to be open in every zone 423 covers.
| Rate center | Exchanges |
|---|---|
| College Station, TN | 2 |
Related area codes
Overlay codes — same territory as 423, same rules: 729
Other area codes in Tennessee:
Why area code alone is not enough
- Mobile numbers travel with their owners, and a ported number keeps its original 423 area code and exchange. A 423 number tells you where the line was assigned, not where the person is today.
- Under Regulation F, when you know of more than one location for a consumer — a mailing address in one zone, an area code in another — the time must be convenient in every one of them. Use the address-state field above to add the zones you know about.
- Call only when the window is open in every location you know about, and stop calling at times the consumer tells you are inconvenient, whatever the clock says.
Questions
What time can you call area code 423?
Area code 423 is in Tennessee, on Central and Eastern time. Debt collection: federal — Presumed convenient 8 a.m.-9 p.m. local time at the consumer's location, any day. Tennessee: Collectors must assume 8 a.m.–9 p.m. local time is convenient (same as federal). Telemarketing: federal — 8 a.m.-9 p.m. local time at the called party's location, any day. Tennessee: 8 a.m.–9 p.m. local time at the called party, any day, absent prior express permission (same as federal).
What time zone is area code 423?
Area code 423 spans Central and Eastern time. The exchange (the three digits after the area code) decides which; when it is unknown, a call should fit the window in every zone the area code covers.
Can a debt collector call a 423 number on Sunday?
Sunday is not singled out: Tennessee's debt-collection hours are every day 8:00 a.m.–9:00 p.m., and the federal 8 a.m.–9 p.m. window also applies. A consumer can still tell a collector that Sunday is inconvenient.
Is the 423 area code enough to know the person's local time?
No. Mobile numbers move with their owners and ported numbers keep their area code, so a 423 number may belong to someone in another time zone. If you know other locations for the person, the call should fit the window in all of them.
Sources
Exchange and rate-center data: NANPA CO Code Assignments (utilized, all states) (retrieved 2026-10-07); NANPA NPA listing (area code information) (retrieved 2026-10-07); NANPA rate centers by state (retrieved 2026-10-07); U.S. Census Bureau 2024 Gazetteer (places) (retrieved 2026-10-07); U.S. Census Bureau 2024 Gazetteer (county subdivisions) (retrieved 2026-10-07); U.S. Census Bureau 2024 cartographic boundary file (counties, 1:500k) (retrieved 2026-10-07); USGS GNIS Domestic Names (split-zone states only) (retrieved 2026-10-07); 49 CFR Part 71 - Standard Time Zone Boundaries (retrieved 2026-10-07). Statutes and regulations: 15 U.S.C. § 1692c(a)(1), 12 CFR § 1006.6(b)(1)(i) (Regulation F), Reg F Official Interpretation, comment 6(b)(1)(i)-2 (consumer's location), 12 CFR § 1006.14(b)(2), 47 CFR § 64.1200(c)(1) (TCPA rules), 16 CFR § 310.4(c) (Telemarketing Sales Rule), and the state citations in the rules table.
This page is general information, not legal advice. Laws change and some rules depend on who is calling and why; confirm with counsel. Rules last reviewed 2026-10-07.