[header] How to write a letter to someone in jail [title] Visit the jail website. [step] Jails house inmates who are awaiting trial or who are serving a sentence of no more than one year. Prisons house inmates serving a term of more than one year. 
If the person you wish to communicate with is currently in jail, visit the website of the jail. Jail websites often have helpful information and resources, including the jail's physical address, an inmate database, and the jail's mail policy.