When applying for US citizenship, you have to show evidence of physical presence in the US for 5 years (for most green card holders) or 3 years (for marriage-based green card holders). This evidence should verify from various sources that you have not been out of the country for extended period(s) of time, and have maintained a continuous physical presence in the US. The following are some of the, but not all of the types of evidence that may be used:
- Employment records (W2s)
- School attendance reports/transcripts
- US bank statements
- US tax returns or transcripts with US residence on them
- Proof of US auto insurance
- Proof of medical insurance in US
- House or rent payments for US residence
- US driver’s license
- US credit cards
- Photographs taken while in US
- Membership in US organizations