Area Code

678 區號:亞特蘭大都會區覆蓋指南

678 區號是亞特蘭大都會區的覆蓋區號。了解它涵蓋的城市、時區、它與 404/770/470/943 的關係以及如何獲得一個。

Akil Patel

Senior Writer

Jul 22, 202412 min read
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678 area code — metro Atlanta full-coverage overlay since 1998, sits with 404, 770, 470, and 943 across the same map, Eastern Time

Quick answer: The 678 area code is a metro Atlanta overlay — it covers the entire greater-Atlanta region (Fulton, DeKalb, Cobb, Gwinnett, and surrounding counties), the same map as 404, 770, 470, and 943. All five codes are equally local. Major cities include Atlanta, Marietta, Sandy Springs, Roswell, Alpharetta, Johns Creek, and Decatur. It runs on Eastern Time (UTC-5, UTC-4 in summer), launched in 1998 as the first full-metro overlay, and requires 10-digit dialing for every local call.

The 678 area code: how one overlay connects all of metro Atlanta

A 678 number does not mean a specific suburb or a single county. It means metro Atlanta, full stop.

That surprises people who expect an area code to map to one neighborhood. In Atlanta, five codes share the same ground, and this is one of them.

Here is how the overlay system works, which cities and counties it reaches, what time it is there, and how a business anywhere can get a local Atlanta line.

  • 678 launched in 1998 as the first true full-metro overlay in the Atlanta region, covering the exact same geography as both 404 and 770 simultaneously — rather than carving out a new geographic slice the way 770 did in 1995, the 678 assignment introduced a new model where an area code shares an entire metro footprint rather than a defined sub-region
  • Metro Atlanta's five-code overlay system is one of the most complex local numbering arrangements in the southeastern United States — with 404, 770, 678, 470, and 943 all sharing the same counties and cities, the Atlanta footprint requires callers and businesses to treat all five codes as interchangeable local identifiers rather than geographic markers
  • Atlanta's rapid population growth since the 1996 Olympics has driven consistent demand for new overlay codes across the metro — the city's expansion from roughly 3 million to more than 6 million metro residents over three decades required three additional overlays beyond the original 404 and 770 split to keep pace with phone number demand

What the 678 area code actually covers

Map of 678 area code coverage across metro Atlanta — Fulton, DeKalb, Cobb, and Gwinnett counties, with major cities including Atlanta itself, Marietta, Sandy Springs, Roswell, Alpharetta, Johns Creek, and Decatur

The 678 area code is an overlay for the Atlanta, Georgia metropolitan region. It is layered directly on top of the older 404 and 770 codes.

So it covers the exact same map they do, from the city core to the outer suburbs.

One region, five codes

Metro Atlanta is now served by five codes: 404, 770, 678, 470, and 943. They all overlap the same territory.

Two phones in the same building can carry different codes. All of them are equally local.

Cities and counties on the code

Anchor cities served by the 678 area code — Atlanta in Fulton and DeKalb counties as the state capital and urban core, Marietta in Cobb as a major northwest suburb, Sandy Springs and Roswell and Alpharetta and Johns Creek in Fulton, and Decatur in DeKalb

Because this is an overlay, its reach matches the whole metro footprint. Here are the anchor areas it covers.

AreaCountyRole in metro Atlanta
AtlantaFulton / DeKalbState capital, urban core
MariettaCobbMajor northwest suburb
Sandy SpringsFultonBusiness and corporate hub
RoswellFultonLarge northern suburb
AlpharettaFultonTech and finance corridor
Johns CreekFultonFast-growing suburb
DecaturDeKalbWalkable east-side city

The four core counties are Fulton, DeKalb, Cobb, and Gwinnett. Other communities on the code include Norcross, Smyrna, Duluth, Lawrenceville, and Newnan.

為什麼覆蓋範圍這麼廣

亞特蘭大地鐵是美國最大的本地呼叫區之一。一個單一的覆蓋物遍布所有這正是原因。

如果您的客戶居住在大亞特蘭大的任何地方,則此代碼對於所有客戶來說都視為本地代碼。

當你準備好時

Protect your business line.

MCM 的本地號碼附帶經過驗證的來電顯示和智慧呼叫過濾 - 客戶始終知道是您本人,垃圾郵件永遠不會到達您的團隊。

取得您的本地號碼

What time zone is the 678 area code in?

亞特蘭大都會區運行 Eastern Time。冬季為 UTC-5,夏令時間為 UTC-4。

它與紐約、邁阿密和東海岸其他地區共享時鐘。

正確安排通話時間

當地營業時間為上午 9 點至下午 5 點。東。從西海岸出發,時間為上午 6 點至下午 2 點。你的時間。

在該窗口期進行出站活動,並透過地鐵爬升來提高應答率。

How the Atlanta overlay system works

The 678 and metro Atlanta overlay explained — 404 as the original 1947 code, 770 added in 1995 as numbers ran low, 678 added in 1998 as the first true full-coverage overlay, then 470 in 2010 and 943 in 2022 stacked on top, all sharing the same metro Atlanta footprint, plus what the overlay means for users: mandatory 10-digit dialing on every local call, existing numbers unchanged across all five codes, and intra-overlay calls billed as local

亞特蘭大從一個代碼開始, 404, back in 1947. As the metro exploded, the numbers ran out.

Rather than splitting the map and making people change numbers, regulators added new codes on top.

時間表一目了然

The 770 代碼到達 1995 對於遠郊。這 678 後面的程式碼 1998 作為完整的地鐵覆蓋。

然後 470 被添加到 2010, 和 943 住在 2022。每一個都可以吸收需求而不重新劃定邊界。

You always dial ten digits

由於有如此多的重疊代碼,每個本地呼叫都需要完整的十位數字。七位數撥號在亞特蘭大已經使用了幾十年了。

這現已成為全國標準,因此大多數呼叫者已經自動執行此操作。

How to dial a 678 number

How to dial a 678 number — anatomy of a 678 phone number broken into area code, exchange, and subscriber digits totaling 10 digits, with three dialing scenarios: local call within the 678 metro Atlanta area uses the full 10 digits with no leading 1, long-distance calls outside the metro add a 1 prefix, and international calls from abroad use exit code plus 1 plus the full 10-digit number, with the key rule that 678 requires 10-digit dialing for every call inside the metro Atlanta overlay zone

格式取決於您從哪裡撥打電話。撥打亞特蘭大都會覆蓋範圍內的本地電話(撥打 404、770、678、470 或 943 號碼)需要 完整 10 位數字, area code included, even when you're calling a neighbour.

地鐵外的長途電話添加 1 前綴。國際呼叫者撥打退出代碼(通常 00 來自歐洲大部分地區, 011 來自美國, 0011 來自澳洲),那麼 1 對於美國國家/地區代碼,則為完整的 10 位數字。

The single rule to remember: never use 7-digit dialing 亞特蘭大地鐵內。由於五個代碼共享同一個地圖,網路在每次呼叫時都需要區號才能正確路由。

  • 從美國境外撥打 678 亞特蘭大都會區號碼需要您所在國家/地區的國際退出代碼,然後是美國國家代碼 1,然後是完整的 10 位號碼 — 與國際聯絡人共享的乾淨格式是 +1-678-XXX-XXXX,無論呼叫者所在國家/地區或營運商如何,都可以在全球任何行動裝置上使用
  • 從美國或加拿大任何地方撥打 678 號碼只需撥打 1,然後撥打完整的 10 位數號碼 — 前導 1 向北美編號計畫發出信號,表明呼叫正在跨越本地區域邊界,即使是從鄰近的喬治亞州區號(例如 706 或 762)撥打時也是如此
  • 亞特蘭大都會區所有五個代碼(404、770、678、470 和 943)之間的呼叫均按本地電話計費,而不是長途電話 — 意味著瑪麗埃塔的企業撥打亞特蘭大客戶的 404 號碼或桑迪斯普林斯的辦事處撥打 Gwinnett 供應商的 770 線路,均需支付當地費率,無論通話雙方顯示的是哪五個代碼

Getting a local Atlanta number

Why a 678 metro Atlanta number helps your business — local trust signal with answer rates rising from 40 percent on unknown numbers to 75 percent on local numbers, work from anywhere with the number routed to laptop, mobile, or desk phone in under five minutes, instant credibility tying your brand to the metro Atlanta market, and a three-step setup: choose a 678 number, connect it to any device, and start receiving calls

您不需要在巴克海特設有辦公室即可使用亞特蘭大當地線路。虛擬號碼透過網際網路將通話路由至您擁有的任何裝置。

My Country Mobile (MCM) 可在幾分鐘內透過自助服務入口網站或 API 提供美國本地號碼,包括亞特蘭大都會區前綴。

為什麼本地線路能夠建立信任

Atlantans answer local numbers far more readily than unknown out-of-state calls.熟悉的地鐵代碼表明您是 社區的一部分.

對於一個 在阿爾法利塔 (Alpharetta) 創業或在科布縣 (Cobb County) 開展服務業務,這種信任變成了接聽的電話和預訂的工作。

無需合同,也無需硬件,大約五分鐘即可完成設置。

  • 虛擬 678 號碼可透過網路將通話路由至您已擁有的任何裝置(手機、筆記型電腦、桌上型電話或軟體電話應用程式),無需任何亞特蘭大實體辦公室或喬治亞州企業註冊 — 您的團隊可以接聽來自任何城市或國家的亞特蘭大都會區電話,並且無論您的團隊實際位於何處,呼叫者都只能在其來電顯示上看到本地 678 前綴
  • MCM 的 678 個虛擬號碼包括每個套餐的呼叫轉接、語音郵件到電子郵件、簡訊和呼叫分析 — 為面向亞特蘭大的銷售和支援團隊提供全套專業呼叫管理功能,無需在您的團隊日常使用的設備之外進行單獨的軟體訂閱或硬體安裝
  • 號碼攜號轉網讓企業可以將現有的 678 線轉移到 MCM,而無需更改亞特蘭大客戶已儲存的號碼 — MCM 在後台管理目前承運商的轉接,同時團隊仍使用臨時號碼,大多數連接埠會在五到十個工作天內完成,具體取決於發布承運商的時間表

Telling real calls from spoofed ones

本地代碼也被濫用。詐騙者偽造附近的號碼,讓通話看起來很安全,這種策略稱為 鄰居欺騙.

A genuine business call comes from a registered, authenticated line. MCM 透過以下方式路由流量 STIR/SHAKEN 來電驗證 減少欺騙性呼叫並維持合法流量的可信度。

值得維持的快速習慣

如果來電者聲稱自己是銀行或機構, hang up and dial the official number yourself。 Real organizations always expect that.

對於您自己的外撥電話,正確註冊的號碼可以讓您遠離垃圾郵件過濾器。

  • 亞特蘭大都會區市場的鄰居欺騙行為尤其常見,因為詐騙者知道亞特蘭大人習慣於同等信任所有五個本地代碼(404、770、678、470 和 943) — 如果來自任何這些代碼的通話在付款、政府帳戶或公用事業中斷方面造成意外的緊急情況,請將其視為可疑,並透過直接撥打該組織的官方號碼來驗證呼叫者,而不是回撥顯示在呼叫者 ID 上的號碼
  • MCM 對所有出站流量實施的 STIR/SHAKEN 呼叫身份驗證對每個呼叫進行數位簽名,以便接收運營商可以確認始發號碼未被欺騙 — 使用 MCM 經過驗證的 678 線路的企業發現,被主要運營商標記為“可能是垃圾郵件”或“疑似詐騙”的呼叫明顯減少,從而提高了亞特蘭大合法外展活動的應答率
  • 喬治亞州居民可以透過reportfraud.ftc.gov向聯邦貿易委員會和喬治亞州州長消費者保護辦公室舉報來自任何亞特蘭大都會區代碼的可疑欺騙或詐騙電話 — 提交報告建構了監管資料集,FCC 使用該資料集對針對特定區號區域的大量欺騙操作採取執法行動

The bottom line on this Georgia code

678這個數字告訴你一件事: 東部時間 亞特蘭大都會區,跨越五碼區域的某個地方。它不依賴單一郊區。

使用它來安排更聰明的通話、篩選未知號碼並確定亞特蘭大當地線路是否適合您的業務。

如果有的話,很快就能得到一個。 Browse local US numbers at mycountrymobile.com and pick the code your customers already know.

當你準備好時

準備好在您銷售的任何地方聽起來都很本地化了嗎?

MCM 透過呼叫路由、分析和 CRM 就緒集成,可在幾分鐘內啟動業務號碼。開始免費試用—無需卡片即可瀏覽庫存。

開始免費試用

Frequently asked questions about the 678 area code

Where is the 678 area code located?

它涵蓋了喬治亞州整個亞特蘭大都會地區,包括亞特蘭大、瑪麗埃塔、桑迪斯普林斯、羅斯威爾、阿爾法利塔和迪凱特。

678 地區位於哪時區?

東部時間,與東海岸其他地區相同。標準時間為 UTC-5,夏令時間為 UTC-4。

678 與 404、770、470 和 943 有何關係?

所有五個代碼都覆蓋同一亞特蘭大都會區。它們同樣是本地的,任何社區的電話都可以攜帶其中的任何一個。

在亞特蘭大必須撥打十位數字嗎?

是的。由於有多個重疊代碼,每個本地呼叫都需要完整的十位數號碼。

如果我不住在亞特蘭大,我可以獲得 678 號碼嗎?

是的。 A virtual phone number gives you a local Atlanta line that rings on any device, no matter where you are based.

678 是手機區號還是固定電話代碼?

兩者都不是具體的。與所有現代覆蓋代碼一樣,它被分配給整個地鐵的行動電話和固定電話號碼。

Should I trust every call from a 678 number?

不是自動的。任何本地代碼都可以被欺騙。在分享詳細資訊之前,請透過官方電話號碼核實意外來電者的身分。

Get a 678 number for your business

A metro Atlanta presence used to mean leasing space in Buckhead or Midtown. Now it's a few-minute signup.

My Country Mobile offers 678 virtual numbers with call forwarding, voicemail-to-email, SMS, and AI call transcription. Calls route to any device worldwide, and over 17,500 businesses already trust MCM with their virtual phone presence.

Get a 678 virtual number →

Written by

Akil Patel

Senior Writer

Akil writes the MCM field guides on phone numbers, dialing rules, and area-code references used by ops teams across North America.

嘗試平台。 午餐前接電話。

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