AskKaka lists the STD code of Raigarh that is 07762. Raigarh is a part of Chhattisgarh and the ISO code of Chhattisgarh state is CT.
Raigarh STD code aka subscriber trunk dialing code is 07762 which is mentioned above on this page of AskKaka. We are great resource of finding Raigarh std code of Chhattisgarh (CT).
Useful Info :-
Please take a note that if you are in India and dialing a landline number of Raigarh then you will have to dial STD code 07762 as a prefix followed by the phone number of a landline user and if you are calling Raigarh's phone number from a foreign country then you need to add +91 (the country code) followed by 7762, e.g. +917762 (no need to add "0" as prefix) followed by the landline phone number.
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