The authorities will be hunting that person down...
Locate the state, then the city or county where you think they are being held.
If a person on bail does not show up for court, the bailbondsman, law enforcement and everyone else with any interest in the entire country (or the entire world for that matter) will be hunting that person down.
The person who is out on bail will most likely get another charge of ‘failure to appear’ added to their current charges.
To find your jail's bail policies, research eligibility for bail, or to search for an inmate or arrestee, begin here: