Each library location has different parking options. The Campus Parking Office has more detailed information about visitor parking.
On the west side of the Main Library building is a large parking lot with some metered spots. However, vehicles cannot be parked in this lot overnight, even when the Undergraduate Library is open 24 hours.
The map below highlights available metered parking around the Main Library in yellow, including lot E3, which surrounds the building.
You can also find more details about parking locations in Urbana and Champaign at: