* State-issued ID card (aka the lesser equivalent to a driver's license card)
* Federal-issued passport
* Federal-issued passport card (yes, these are a thing)
For some informal examples (if they have a photo):
* Company ID card/documentation
* Library card
* Medical card
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Everyone always has access to a state-issued ID card (or driver's license) and a passport issued by the federal government. Most people satisfy the "two forms of identification" requirement found in many situations with them.