Korean Postal Code Guide: Find ZIP Code for Any Address

Ever tried shipping a package to Korea—or filling out a visa form—only to get stuck on the “postal code” field? You’re not alone. South Korea uses a highly structured 5-digit ZIP code system that can be confusing if you’ve never encountered it before. Whether you’re ordering K-beauty products, sending documents for a university application, or helping a friend receive mail at their Seoul apartment, getting the postal code right is non-negotiable.

In this guide, you’ll learn exactly how the Korean postal code system works, how to look up any address instantly, and how to format a Korean address correctly—so your mail or package actually arrives.

• Korean postal codes are exactly 5 digits (e.g., 04524 for central Seoul).
• The new system launched in August 2015, replacing the old 6-digit codes.
• You can look up any Korean ZIP code free at 우편번호찾기 (Korea Post) or via Jusome’s address tool.
• Postal codes in Korea are building-specific—not street or neighborhood-level like in many Western countries.
• Always include the ZIP code when shipping internationally to Korea; omitting it causes significant delays.

What Is a Korean Postal Code?

A Korean postal code (우편번호, upyeonbeonho) is a 5-digit number that identifies a specific delivery point in South Korea. Since the nationwide reform in August 2015, every building in Korea—from a tiny convenience store to a 50-story apartment tower—has its own unique 5-digit code.

Before 2015, Korea used a 6-digit system based on administrative districts. The new system aligns with the road name address (doro명주소) format that Korea officially adopted, making the postal infrastructure more logical and internationally compatible.

Key characteristics of Korean postal codes

• Always 5 digits — no letters, no hyphens
• Building-level precision — one code per building or building complex
• Region-coded — the first two digits broadly indicate the metropolitan area or province
• Mandatory for international mail — Korea Post requires the code for cross-border deliveries

If you find a 6-digit code somewhere online, it’s outdated. Always verify using an official lookup tool before using any Korean postal code.

How the Korean ZIP Code System Works

The 5-digit format is organized hierarchically. Here’s a simplified breakdown:

The first two digits follow a regional pattern:

• 01–09: Seoul
• 10–12: Gyeonggi (northwest)
• 13–16: Incheon & Gyeonggi (west)
• 17–18: Gyeonggi (south)
• 19: Gangwon
• 20–25: Chungcheong (North & South)
• 26–29: Daejeon & Sejong
• 30–39: Gyeongsang & Daegu
• 40–49: Busan & Ulsan
• 50–59: Jeolla & Gwangju
• 60–63: Jeju Island

This regional encoding is helpful when you want to quickly sanity-check whether a code belongs to the right city.

How to Find a Korean Postal Code Online

There are several reliable ways to look up a Korean postal code in minutes—even if you don’t read Korean.

Method 1: Korea Post Official Website

The most authoritative source is the Korea Post (우체국) postal code search at search.epost.go.kr. The interface supports Korean input and returns the official 5-digit code instantly. Results include the full road name address in Korean and a Romanized version.

Steps:

1. Go to the Korea Post postal code search page
2. Type the building name, road name, or district name in Korean
3. Click “검색” (search)
4. Select the matching address from the results
5. Copy the 5-digit code displayed in red or blue

Method 2: Jusome Address Converter

If you’re not comfortable with Korean characters, Jusome.com provides a bilingual address lookup that shows the postal code alongside the English romanization of the full address. This is especially useful for international shoppers filling out shipping forms on sites like Coupang, Olive Young, or Korean government portals.

Method 3: Naver Maps or Kakao Maps

Both Naver Maps and Kakao Maps display the postal code when you search for a specific building. Simply search the building name or address, open the “상세 정보” (details) panel, and the 5-digit code appears at the top. This works well for landmark buildings, universities, hospitals, and popular retail locations.

Method 4: Google Maps (Limited)

Google Maps in Korea sometimes shows postal codes in the address sidebar, but coverage is inconsistent. For critical applications—visa forms, customs declarations, official correspondence—rely on Korea Post or Jusome rather than Google.

Postal Code Format in a Korean Address

Knowing the ZIP code alone isn’t enough—you also need to know where it goes in a Korean address. Korea uses a specific format that differs from US or European conventions.

Standard Korean address format (English)

[Recipient Name]
[Building Number], [Road Name], [District], [City/Province]
[POSTAL CODE], South Korea (Korea)

Real example:

Kim Jiyeon
101, Teheran-ro 12-gil, Gangnam-gu, Seoul
06235, South Korea

Where to place the postal code

On international shipping labels and online forms, the postal code goes after the city and before “South Korea” or on its own dedicated “ZIP/Postal Code” field. When filling out a Korean domestic form, the code goes at the top of the address block (first line), followed by the full address below it.

Common mistakes to avoid

• Using old 6-digit codes: Deprecated since 2015; carriers may still deliver but it causes delays
• Skipping leading zeros: A code like “04524” must be entered as five digits, not “4524”
• Confusing Dong (동) for road name: Korea switched from neighborhood-based (dong) to road-name addresses; use the road name address with the current ZIP code
• Using district-level codes: Each building has its own code—don’t guess based on a nearby address

Postal Codes for Major Korean Cities and Landmarks

Here’s a quick reference table for iconic locations in South Korea’s major cities:

For university campuses, hospitals, and government offices, each building on the campus typically has its own unique postal code. Always look up the specific building rather than using the campus-level code.

Using Korean Postal Codes for International Shipping

If you’re buying from a Korean online store—Coupang, GS Shop, Olive Young Global, or a K-pop merch site—and shipping to an overseas address, or if you’re having items sent to your Korean address from abroad, here’s what to know:

Shipping to Korea from overseas

Carriers like DHL, FedEx, UPS, and EMS (Korea Post’s international service) all require the 5-digit postal code on customs labels. Missing or incorrect ZIP codes are one of the top causes of Korean customs delays.

Checklist before submitting a Korean shipping address:

• ✅ 5-digit postal code (not 6-digit legacy code)
• ✅ Road name address format (not old dong/번지 format)
• ✅ Full building number included
• ✅ “Republic of Korea” or “South Korea” as country (not just “Korea”)
• ✅ Korean phone number included (required for customs)

Personal customs code (개인통관고유부호)

When shipping commercial goods to Korea—even gifts above certain value thresholds—recipients need a personal customs code (gaein tonggwan goyubuho). This is separate from the postal code but equally important. Obtain it free from the Korea Customs Service (관세청) website.

Frequently Asked Questions

What is the Korean postal code format?

Korean postal codes are exactly 5 digits with no spaces or hyphens (e.g., 06235). The system replaced the old 6-digit format in August 2015.

Is South Korea’s ZIP code the same as postal code?

Yes. “ZIP code” and “postal code” refer to the same thing in Korea. The official term in Korean is 우편번호 (upyeonbeonho). Korea does not use the US-specific “ZIP code” term officially, but international shipping forms use both interchangeably.

How do I find a Korean postal code if I only have an English address?

Use Jusome.com to enter an Romanized Korean address and retrieve the correct 5-digit postal code. You can also try the official Korea Post lookup tool, but it requires typing the address in Korean characters.

Can I use the old 6-digit Korean postal code?

Technically mail may still be delivered, but using the old code risks delays or misdelivery. Always use the current 5-digit code for any official documents, visa applications, or international shipping labels.

Do apartment complexes in Korea have multiple postal codes?

Large apartment complexes (단지) may have multiple buildings, and each building typically shares a single postal code with the entire complex. When in doubt, use the complex-level postal code and include the specific building (동) and unit (호) numbers in the address.

What postal code should I use for a PO Box in Korea?

Korea Post (우체국) assigns unique codes to P.O. Boxes (사서함). Look up the specific post office branch where the box is located and use its assigned ZIP code.

Is the Korean postal code required for domestic deliveries?

Yes. All Korean couriers—CJ Logistics, Lotte Logistics, Hanjin, etc.—require the postal code for automated sorting. Packages without it may be returned or delayed.

Conclusion

South Korea’s 5-digit postal code system is precise, building-level, and mandatory for both domestic and international deliveries. Whether you’re a student applying to a Korean university, an expat setting up your first apartment, or an international shopper eagerly waiting for your Coupang order, knowing how to find and use the correct Korean ZIP code saves time and prevents frustrating delivery failures.

The fastest way to look up any Korean postal code is through the official Korea Post tool or through Jusome.com, which offers a bilingual interface perfect for English speakers navigating Korean addresses. Bookmark it—you’ll use it more than you think.

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