In general, a 1919 penny in good condition is worth around $0.25 to $0.50. However, if the penny is in mint condition (meaning it has no noticeable wear or damage), it could be worth up to $5-$10.
There are also some specific varieties of 1919 pennies that are worth more money. For example, the 1919-D (Denver mint) penny is a relatively rare variety, and can be worth up to $20 in good condition. The 1919-S (San Francisco mint) penny is also a rare variety, and can be worth up to $30 in good condition.
If you have a 1919 penny, it is always a good idea to have it appraised by a professional coin dealer to determine its exact value.