Haryana became a new state of India on 1 November 1966 with Chandigarh as its capital, and since then it has made spectacular progress to become one of the most prosperous states of India. Haryana's geographical proximity to the national capital New Delhi and, a well-developed telecom and transport infrastructure, are its major strengths in the economic field.
Haryana has the third highest per capita income in the country at Rs 67,891 in 2009 including the largest number of rural millionaires in India. It is one of the most industrialized states of India, and is considered the current growth engine of India. Gurgaon city rapidly emerging as a major hub for the information technology and automobile industries. Gurgaon is home to Maruti Udyog Limited, India's largest automobile manufacturer and Hero Honda Limited, the world's largest manufacturer of two-wheelers. Panipat, Panchkula and Faridabad are also industrial hubs with the Panipat Refinery being the second largest refinery in South Asia. There are also long established steel and textile industries in the state.
As the birthplace of ancient Indian Vedic Civilization, the 5000-year-old history of Haryana is steeped in glory. It was in Haryana, that Lord Krishna taught us about Karma and Dharma through the Bhagwad Gita. Here Ved Vyas wrote Mahabharata (in Sanskrit) on the banks of river Saraswati.
Presenting here the STD Area Telephone Dialling Codes for Haryana:
| City | STD Code |
| ADAMPUR MANDI | 1669 |
| AMBALA | 171 |
| ASSANDH | 1749 |
| BAHADURGARH | 1276 |
| BARARA | 1731 |
| BARWALA | 1693 |
| BAWAL | 1284 |
| BAWANIKHERA | 1254 |
| BHIWANI | 1664 |
| CHARKHIDADRI | 1250 |
| CHEEKA | 1743 |
| CHHACHRAULI | 1735 |
| DABWALI | 1668 |
| ELLENABAD | 1698 |
| FARIDABAD | 129 |
| FATEHABAD | 1667 |
| FEROJPUR JHIRKA | 1268 |
| GHARAUNDA | 1748 |
| GOHANA | 1263 |
| GURGAON | 124 |
| HANSI | 1663 |
| HISSAR | 1662 |
| JAGADHARI | 1732 |
| JATUSANA | 1281 |
| JHAJJAR | 1251 |
| JIND | 1681 |
| JULANA | 1683 |
| KAITHAL | 1746 |
| KALANAUR | 1258 |
| KALANWALI | 1696 |
| KALKA | 1733 |
| KARNAL | 184 |
| KOSLI | 1259 |
| KURUKSHETRA | 1744 |
| LOHARU | 1252 |
| MEHAM | 1257 |
| MOHINDERGARH | 1285 |
| NARAINGARH | 1734 |
| NARNAUL | 1282 |
| NARWANA | 1684 |
| NILOKHERI | 1745 |
| NUH | 1267 |
| PALWAL | 1275 |
| PANIPAT | 180 |
| PEHOWA | 1741 |
| RATIA | 1697 |
| REWARI | 1274 |
| ROHTAK | 1262 |
| SAFIDON | 1686 |
| SIRSA | 1666 |
| SIWANI | 1255 |
| SONIPAT | 130 |
| TOHANA | 1692 |
| TOHSAM | 1253 |
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