KRAsia · East Asia

South Korea Address Validation API

Validate and standardise South Korea addresses in real time. Get a matched address, geocoordinates, confidence score, and 우편번호 (Upyeon-beonho) data via a single API call.

NNNNN
우편번호 (Upyeon-beonho)
OpenStreetMap
Data Source
Korean
Languages
HIGH
Max Confidence

South Korea Address Validation Demo

Confidence:HIGH
POST /enrich — ResponseSample
{
  "_note": "Sample response — enter any address and click Validate for live data",
  "valid": true,
  "canonical_address": "1 Sejong-daero, Jung-gu, Seoul 04524",
  "confidence": "HIGH",
  "delivery_risk": "low",
  "matched_address": {
    "line1": "1 Sejong-daero",
    "city": "Jung-gu",
    "postal_code": "Seoul 04524",
    "country": "South Korea",
    "iso2": "KR"
  },
  "geocode": {
    "lat": 37.5665,
    "lng": 126.978
  },
  "data_source": "OpenStreetMap",
  "issues": []
}

South Korea Address Format

South Korea introduced a new 5-digit postal code system in 2015. Addresses are written large-to-small in Korean: province/city, district (gu/gun), street name (ro/gil) + number, building name, and apartment number. The Address Agent accepts English transliterations.

Postal Code Name
우편번호 (Upyeon-beonho)
Format
NNNNN
Official Languages
Korean
Sample address:
1 Sejong-daero, Jung-gu, Seoul 04524
Major cities:
SeoulBusanIncheonDaeguDaejeonGwangjuSuwon

Integration Code

curl -X POST https://agent.apitier.com/v1/enrich \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{"address": "1 Sejong-daero, Jung-gu, Seoul 04524"}'

Frequently Asked Questions

What address format does South Korea use?
South Korea introduced a new 5-digit postal code system in 2015. Addresses are written large-to-small in Korean: province/city, district (gu/gun), street name (ro/gil) + number, building name, and apartment number. The Address Agent accepts English transliterations.
What is a 우편번호 (Upyeon-beonho) in South Korea?
South Korea uses a 우편번호 (Upyeon-beonho) with the format NNNNN to identify delivery areas. The APITier Address Agent API validates and standardises addresses including the 우편번호 (Upyeon-beonho) as part of the response.
How do I validate a South Korea address via API?
Send a POST request to https://agent.apitier.com/v1/enrich with your address string in the request body and your API key in the x-api-key header. The response includes the standardised South Korea address, geocoordinates (lat/lng), a confidence score (HIGH/MEDIUM/LOW), and data source information.

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