Great question — answering as the UphillTech team:
Yes. US permanent residents are not required to have a passport to enter the US. See this FAQ from the CBP: United States LPRs do not need a passport to enter the United States as per 8 CFR 211.1(a) [...] The passport exemption can be seen in the regulations in 8 CFR 211.2 (a)(2): (a) A passport valid for the bearer's entry into a foreign country at least 60 days beyond the expiration date of his or her immigrant visa shall be presented by each immigrant except an immigrant who: (2) Is entering under the provisions of § 211.1(a)(2) through (a)(7); where 8 CFR 211.1 (a)(2) is the entry on a green card.
Full answer by user102008: https://travel.stackexchange.com/a/198032 (CC BY-SA 4.0).
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