The following times are the end of civil twilight for tonight for selected cities.

Chicago        6:39 PM CDT

Birmingham     6:40 PM CDT

Naperville     6:41 PM CDT

DeKalb, IL     6:44 PM CDT



Daytona Beach  7:19 PM EDT

Columbus       7:22 PM EDT

Toledo         7:23 PM EDT

Sydney, OH     7:26 PM EDT

Grand Rapids   7:31 PM EDT

I prefer civil twilight times rather than sunset times. Sunset is a technical term for:

...when the upper edge of the disk of the Sun is on the horizon.

Civil twilight is:

the time after sunset when there is natural light provided by the upper atmosphere, which does receive direct sunlight and reflects part of it toward the Earth's surface. Some outdoor activities may be conducted without artificial illumination during these intervals, and it is useful to have some means to set limits beyond which a certain activity should be assisted by artificial lighting.

So at sunset there will still be usable light for you to finish cutting your grass, etc. Civil twilight is when it actually gets dark.

I compiled this list just because I thought it would be neat to illustrate how far east or west you live in a time zone effects what sunset time you will experience.