How do I renew my expired HKSAR passport in the US?
Use this form and nominate which Chinese Diplomatic and Consular Mission you want to collect your passport from. GovHK: Online Application for HKSAR Passport If you have a Hong Kong Identity Card, you can use that to pass through immigration into Hong Kong and then renew your HKSAR passport here. How you get out of USA and board the plane with an expired passport, IDK.