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Given a contract address, is there a way to find the block number at which it was deployed?

Does Etherscan's API provide information about this?

Co-Founder at sablier.com, and open-source developer. I have a broad range of interests, including longevity, epistemology, physics, and psychology.

Yes, you can find the block number at which a contract was deployed, and Etherscan's API can help with this 
Use Use Etherscan’s getContractCreation API, it is recommended.