AskKaka lists the STD code of Manendragarh that is 07771. Manendragarh is a part of Chhattisgarh and the ISO code of Chhattisgarh state is CT.
Manendragarh STD code aka subscriber trunk dialing code is 07771 which is mentioned above on this page of AskKaka. We are great resource of finding Manendragarh std code of Chhattisgarh (CT).
Useful Info :-
Please take a note that if you are in India and dialing a landline number of Manendragarh then you will have to dial STD code 07771 as a prefix followed by the phone number of a landline user and if you are calling Manendragarh's phone number from a foreign country then you need to add +91 (the country code) followed by 7771, e.g. +917771 (no need to add "0" as prefix) followed by the landline phone number.
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