What Is +57 CO

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Last updated: April 10, 2026

Quick Answer: +57 is the international dialing code for Colombia, while CO is its ISO country code abbreviation. Together, they identify Colombia in global telecommunications and digital systems, with +57 representing the country's assigned telephone numbering prefix established by the International Telecommunication Union.

Key Facts

+57 is Colombia's official international dialing code assigned by the ITU (International Telecommunication Union)
CO is the two-letter ISO 3166-1 alpha-2 country code for Colombia, used in internet domains (.co) and international standards
Colombia has approximately 52 million people making it the second-most populous country in South America
The Colombian telephone system operates with +57 followed by a 10-digit local number (area code + subscriber number)
Colombia's .co domain extension launched in 1991 and has become globally popular for generic business use beyond just Colombian entities

Overview

+57 CO represents Colombia's official international identification codes in telecommunications and digital systems. The prefix +57 is the country calling code assigned by the International Telecommunication Union (ITU), while CO is the two-letter ISO 3166-1 alpha-2 country code used in international standards, internet domains, and country registries.

Colombia, officially the Republic of Colombia, is located in the northwestern region of South America and has a population of approximately 52 million people. These standardized codes are essential for international communication, business operations, travel coordination, and digital services that require country identification.

How It Works

Understanding how +57 CO functions in global systems helps explain its importance:

International Dialing: When calling someone in Colombia from abroad, users dial the international access code for their country (such as 011 from the United States), followed by +57, then a 10-digit local Colombian phone number. For example, a complete Colombian phone number appears as +57-1-234-5678.
Area Code Structure: Colombia's 10-digit telephone system includes a 1 or 2-digit area code followed by an 8-digit subscriber number. Major cities like Bogotá use area code 1, while other regions have distinct area codes identifying their geographic location.
Digital Country Code Usage: The CO abbreviation appears in internet domains (.co), email addresses, shipping addresses, and international business registrations. The .co domain extension, launched in 1991, has become particularly significant in global commerce.
International Standards: +57 CO appears in passenger manifests, customs documentation, banking systems, and telecommunications routing protocols. All international organizations and service providers use these codes for identifying Colombian users and locations.
Mobile and Landline Distinction: Both mobile phones (starting with 3) and landline phones (starting with 2-8) in Colombia use the same +57 country code, with the next digit indicating the service type and region.

Key Comparisons

Aspect	+57 Colombia	Similar Examples	Distinction
Country Code Format	+57 (3 digits)	+1 (USA/Canada), +44 (UK)	Colombia uses a 3-digit code; North American code is shared between three countries
Phone Number Length	10 digits total	+1 uses 10 digits, +44 uses 10-11 digits	Colombian numbers are consistently formatted with fixed 10-digit structure
Country Code Abbreviation	CO (ISO 3166-1 alpha-2)	US, GB, CA, MX	CO is distinct from other South American codes: BR (Brazil), AR (Argentina), CL (Chile)
Domain Extension	.co (generic use popular)	.uk, .ca, .mx	Colombia's .co domain has become internationally recognized for commercial use beyond domestic applications
Population Size	~52 million	Spain (~47M), Argentina (~46M)	Colombia is the second-most populous country in South America after Brazil

Why It Matters

The significance of +57 CO codes extends across multiple sectors and applications:

Global Business Communication: Companies operating internationally must properly format Colombian contact information using +57 for phone calls and CO for business registrations. Incorrect formatting leads to failed communications and professional miscommunication.
International Travel and Tourism: Travelers and tour operators rely on +57 codes to contact hotels, guides, and services within Colombia. Tourist sites, embassies, and travel agencies maintain accurate +57 phone numbers for customer service.
Remote Work and Outsourcing: With millions of remote workers and outsourcing companies in Colombia, proper country code usage ensures reliable communication with international clients and contractors across all time zones.
Banking and Financial Services: International money transfers, credit card processing, and digital payment platforms require correct country identification using CO and +57 codes. Financial institutions use these standards for fraud prevention and account verification.
Digital Services and Verification: Online platforms, social media services, and authentication systems use CO country codes for user registration, location verification, and service localization. This enables proper content delivery and compliance with local regulations.

Understanding +57 CO is essential for anyone communicating with Colombia, conducting business in the country, traveling there, or using digital services that require international country identification. These standardized codes ensure reliable, secure, and efficient global connectivity with Colombia's diverse population and thriving economy.