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| STD Numbers of Bihar | | |
| | | Bihar Areas | STD Codes | | Imamganj | 06331 | | Jahanabad | 06114 | | Jainagar | 06246 | | Jamui | 06345 | | Jhajha | 06349 | | Jhanjharpur | 06273 | | Kahalgaon | 06429 | | Katihar | 06452 | | Katoria | 06425 | | Khagaria | 06244 | | Kishanganj | 06466 | | Korha | 06457 | | Lakhisarai | 06346 | | Madhepura | 06476 | | Madhubani | 06276 | | Maharajganj | 06153 | | Mahua | 06227 | | Mairwa | 06157 | | Mallehpur | 06348 | | Masrakh | 06159 | | Mohania | 06187 | | Monghyr | 06344 |
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