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Also known as: ISO Country Codes
International standard defining codes for country names and their subdivisions.
DESCRIPTION
ISO 3166 provides standardized country and subdivision codes for global interoperability. ISO 3166-1 defines country codes (alpha-2, alpha-3, numeric), while ISO 3166-2 defines principal subdivisions, and ISO 3166-3 covers obsolete codes. These codes are foundational for address normalization, localization, and cross-border data integration. Many systems and standards, including payments and language tags, rely on ISO 3166 for unambiguous country references. Regular updates reflect geopolitical changes.
ALTERNATIVE DEFINITIONS
International Organization for Standardization (ISO)
ISO 3166 is the International Standard for country codes and codes for their subdivisions.
Concise official definition covering countries and subdivisions.
ISO Online Browsing Platform
Find details about ISO 3166 codes for the representation of names of countries and their subdivisions.
Provides authoritative code lookup via ISO OBP.
RELATED TERMS
ISO State Codes FIPS IANA Language Tags CLDR Geocoding Country Master Data
COMPETING TERMS
KNOWLEDGE AREAS
Reference & Master Data Data Management Data Integration & Interoperability Data Governance Data Quality
TARGET AUDIENCE
Data Steward Information Analyst Data Architect Data Engineer Data Governance Manager
EXTERNAL SOURCES
- Wikipedia - ISO 3166
- ISO - Official ISO 3166 overview
- DataHub - Open country code dataset
- Unicode CLDR - Locale data referencing ISO 3166
TOP QUESTIONS
Why use ISO 3166 instead of free-form country names?
It eliminates ambiguity, supports localization, and ensures consistent joins across datasets and systems.
Category: Relevancy
What are ISO 3166-1 alpha-2 codes used for?
Two-letter country codes widely used in domains like e-commerce, payments, and locale identifiers.
Category: Example
How do ISO 3166-2 codes relate to state or province codes?
They standardize principal subdivisions within countries, supporting address normalization and regional analytics.
Category: Explanation
How are geopolitical changes handled in ISO 3166?
Maintenance agencies issue updates; organizations must version their code lists and audit changes.
Category: Management
What is a common mistake with ISO 3166 in data models?
Using country names as keys instead of stable codes, causing joins to break on renames.
Category: Mistakes
Does ISO 3166 include territories?
Yes, it includes countries and certain territories, with clear coding semantics documented by ISO.
Category: Misunderstanding
What’s the risk of mixing ISO 3166 with FIPS codes?
Mismatched keys can corrupt joins; maintain explicit crosswalks and identifiers.
Category: Risks
How to start implementing ISO 3166 in a database?
Create reference tables keyed by alpha-2, with alpha-3 and numeric as attributes; include version and effective dates.
Category: Getting Started
What systems depend on ISO 3166?
Payment networks, shipping carriers, localization frameworks, and international reporting standards rely on it.
Category: Example