Mattoon Wal-MartFlat large parking lot. Wal-Mart is 24 hours. I-57 exit 190B; Wal-Mart on the left. State: Illinois City: Mattoon Nearest Town: Mattoon Status; Official Cost: Free Nearest Road: Paved Scenery Rating: Months Opened: Unknown Extras: None Number of Camp Sites: Unknown Max Stay : Unknown -