Every state might be slightly different, but this is an example from the state of Arizona on the requirement to satisfy state residency.
1. Date of and state in which Motor Vehicle is registered
2. Date of and state issuing driver’s license
3. Employment history, including assured future permanent employment in Arizona
4. Transfer of major banking services to Arizona
5. Applications for loans, scholarships, grants-in-aid, or other such assistance
6. Date and state in which registered to vote
7. Place of prior attendance in educational institutions, including high schools, and any information held by such schools affecting domicile
8. Marital status and work record of registrant and spouse
9. Change in permanent address on all pertinent records
10. State in which registered with Selective Service
11. Military records
12. Ownership of real property
13. All other material of whatever kind or source which may have a bearing on determining domicile or resident status