Where the Central and Eastern time zone line runs

Eastern Time is everything east of the line in 49 CFR 71.5, including all of Maine. Central Time is everything west of that line until the mountain boundary. The line is not a meridian. It follows county borders, a few rivers, and, in Gulf County, Florida, the Intracoastal Waterway.

On the Great Lakes the line bends into the Upper Peninsula so Gogebic, Iron, Dickinson, and Menominee counties stay on Central Time with Wisconsin. The rest of Michigan, including the rest of the Upper Peninsula, is Eastern Time.

In Indiana the line cuts in from Illinois twice: six northwestern counties and six southwestern counties are Central, and the other 80 are Eastern. Kentucky and Tennessee are split by county lines through the middle of each state, not by a straight longitude. Florida's Panhandle west of the Apalachicola is Central, except that Gulf County itself is divided.

A municipality that sits on this line is legally on Central Time under 49 CFR 71.5(h). This map does not trace city limits, so a town on the line can disagree with the county color.