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Hi, how to know what's my visa office? I am currently living in NC, USA now. Thank you so much!

You can request from CIC by sending them e-mail, i will share a template.
 
If you want to find visa office:

By sending an email to CPC-CTD-Ottawa@cic.gc.ca

This is the email format they require:

IMPORTANT: You must provide us with your application number in the subject line of your email and include in the body of your email the following information:

* Surname and Given name(s)
* Date of birth (YYYY-MM-DD)
* Unique Client Identifier (UCI) number / Client ID number
* Category of Immigration (CEC, Provincial Nominee, Family Class, Federal Skilled Worker, Temporary Resident)