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Thailand ☎️ Landline / Geographic

Area Code 38 – Chachoengsao/Chon Buri/Rayong

The phone area code for Chachoengsao/Chon Buri/Rayong is 38 (international format +6638). Browse local exchange codes (NXX) and carrier assignments below.

Current Local Time
05:40:55
UTC • UTC +00:00
Full Dialing Format
+6638
Population 106,737
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Admin Region Rayong
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Elevation 7m
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GPS Coordinates 12.6810, 101.2580
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📍 Geographic Location of Chachoengsao/Chon Buri/Rayong

Geographic Coverage and Administrative Jurisdiction

Thailand's area code +66 38 is a geographic National Destination Code (NDC) assigned to the Eastern Seaboard region of the country. This code covers three adjacent provinces: Chachoengsao, Chon Buri, and Rayong. The region is a major industrial hub, home to key economic zones such as the Leam Chabang deep-sea port, the Map Ta Phut industrial estate, and the popular tourist destinations of Pattaya (in Chon Buri) and Ko Samet (in Rayong). Administratively, the code falls under the jurisdiction of the National Broadcasting and Telecommunications Commission (NBTC) of Thailand.

Dialing Formats and Caller Instructions

For local callers within Thailand, the trunk prefix '0' is used before the area code. Thus, to call a fixed-line number in Chon Buri from within Thailand, you would dial 0 38 followed by the 6-digit local subscriber number (total 9 digits after the trunk prefix). For example, a local number in Pattaya might be dialed as 038 123456.

International callers must replace the trunk prefix with Thailand's country code +66. Therefore, the same number would be dialed from abroad as +66 38 123456. Note that the leading '0' is omitted when dialing from outside Thailand.

Overlay and Numbering Considerations

As of the current NBTC numbering plan, there is no overlay code for the +66 38 geographic area. The code is exclusively assigned to fixed-line services (PSTN). However, due to the high density of industrial and commercial activity, some businesses may use VoIP gateways that present a +66 38 caller ID, but the underlying routing may be IP-based. Number portability is available in Thailand, allowing subscribers to retain their numbers when switching providers, but the geographic significance of the code remains tied to the original service address.

Practical Examples for Callers

  • Calling a fixed line in Rayong from Bangkok: dial 0 38 654321.
  • Calling the same number from the United States: dial 011 66 38 654321 (or use the '+' sign on mobile).
  • Calling a fixed line in Chachoengsao from a mobile phone in Thailand: simply dial 038 987654.

When dialing internationally, always check with your carrier for any additional charges, as rates to geographic numbers in Thailand may vary.

❓ Frequently Asked Questions

Which cities or provinces are covered by Thailand area code +66 38?
The area code +66 38 covers the provinces of Chachoengsao, Chon Buri, and Rayong in Thailand. This includes major cities such as Chon Buri city, Pattaya, and Rayong city.
How do I dial a +66 38 number from overseas?
From outside Thailand, dial your country's international access code (e.g., 011 from the US, 00 from most European countries), followed by Thailand's country code 66, then the area code 38 (without the leading 0), and the local subscriber number. For example, 011 66 38 123456.
Is +66 38 a mobile or fixed-line prefix?
+66 38 is a geographic area code assigned to fixed-line (PSTN) services. Mobile numbers in Thailand use different non-geographic prefixes starting with 6, 8, or 9.
Do I need to dial the area code when calling within the same province?
Yes, in Thailand, the area code is an integral part of the national significant number. Even for local calls within the same province, you must dial the full number including the area code (e.g., 038 123456).
Are there any special charges for calling +66 38 numbers from a mobile phone in Thailand?
Calls to geographic numbers like +66 38 are typically included in standard domestic call rates. However, charges may vary depending on your mobile operator and plan. Check with your provider for specific rates.