What is an STD code in India?

STD (Subscriber Trunk Dialling) code is a telephone area code used in India to make long-distance calls within the country. Each city, town, and region has a unique STD code assigned by the Department of Telecommunications (DoT). For example, Delhi's STD code is 011 and Mumbai's is 022.

How do I dial an STD number within India?

To dial an STD number within India, use the format: 0 + STD Code + Local Number. For example, to call a Delhi landline: 0-11-XXXXXXXX. From a mobile phone, you can also dial the full number including the 0 prefix.

What is Delhi's STD code?

Delhi's STD code is 011. This is used for all landline numbers in the National Capital Territory of Delhi.

What is Mumbai's STD code?

Mumbai's STD code is 022. This code covers the entire Mumbai metropolitan area including suburban areas.

How many STD codes does India have?

India has over 2,500 STD codes covering cities, towns, and rural areas across all states and union territories. Metro cities like Delhi, Mumbai, Kolkata, and Chennai have 2-digit codes, while smaller cities and towns have 3 to 5-digit codes.

STD Codes India 2026 — Complete List of Indian Telephone Area Codes

Q: What is the difference between STD and ISD codes?

STD (Subscriber Trunk Dialling) codes are used for domestic long-distance calls within India, while ISD (International Subscriber Dialling) codes are used for international calls. India's ISD code is +91. To call India from abroad, you dial +91, then the STD code (without the leading 0), then the local number.

What is an STD Code?

STD (Subscriber Trunk Dialling) codes are telephone area codes used in India for making long-distance calls within the country. Every city, town, and region in India has a unique STD code assigned by the Department of Telecommunications (DoT), Government of India.

STD codes are essential for dialling landline numbers from one city to another. While mobile phone numbers in India are 10 digits and don't require an STD prefix, landline calls still use the traditional STD dialling system.

Metro City STD Codes

India's major metropolitan cities have short 2-digit STD codes:

City	STD Code	State	Full Dialling Format
Delhi / NCR	011	Delhi	011-XXXXXXXX
Mumbai	022	Maharashtra	022-XXXXXXXX
Kolkata	033	West Bengal	033-XXXXXXXX
Chennai	044	Tamil Nadu	044-XXXXXXXX
Bangalore	080	Karnataka	080-XXXXXXXX
Hyderabad	040	Telangana	040-XXXXXXXX
Ahmedabad	079	Gujarat	079-XXXXXXXX
Pune	020	Maharashtra	020-XXXXXXXX

How to Dial STD Numbers

There are different formats depending on where you are calling from:

Within India (landline to landline): Dial 0 + STD Code + Local Number. Example: 0-11-23456789 for Delhi.
Within India (mobile to landline): Same format — 0 + STD Code + Local Number.
From abroad to India: Dial +91 + STD Code (without leading 0) + Local Number. Example: +91-11-23456789.
Within the same city: Dial only the local number without the STD code.

STD Codes by State

STD codes are organized by state and telecom circles. Here are some important state-level codes:

State / UT	Major City	STD Code
Uttar Pradesh	Lucknow	0522
Rajasthan	Jaipur	0141
Madhya Pradesh	Bhopal	0755
Bihar	Patna	0612
Punjab	Chandigarh	0172
Kerala	Thiruvananthapuram	0471
Assam	Guwahati	0361
Goa	Panaji	0832
Odisha	Bhubaneswar	0674
Jharkhand	Ranchi	0651

Frequently Asked Questions

What is the difference between STD and ISD codes?

STD (Subscriber Trunk Dialling) codes are for domestic long-distance calls within India. ISD (International Subscriber Dialling) codes are for calling other countries. India's ISD code is +91.

Do I need an STD code for mobile calls?

No. Indian mobile numbers are 10-digit numbers that can be dialled directly without any STD code. STD codes are only needed when calling landline numbers from a different city.

How many digits does an STD code have?

Indian STD codes range from 2 to 5 digits. Metro cities like Delhi (11), Mumbai (22), Kolkata (33), and Chennai (44) have 2-digit codes. Smaller cities typically have 3-5 digit codes. The combined length of STD code + local number is always 10 digits.

Are STD codes changing?

The Department of Telecommunications periodically updates STD codes. Some areas have been reorganized or merged. Use our STD Code Finder Tool for the most up-to-date codes.

Free STD Code Lookup Tool

Use our free online STD Code Finder to instantly search any Indian telephone area code. Search by city name, state, or code number — get instant results with no registration required.

Our database covers 100+ STD codes across all Indian states and union territories, updated regularly to reflect the latest allocations by the Department of Telecommunications.

Indian STD Phone Codes