Day is a town in southwest Marathon County, Wisconsin, United States.

The six mile square that would become Day was first surveyed in August and September of 1851 by a crew working for the U.S. government.

Around Christmas of 1852 another crew marked its section corners, walking through the woods and wading the streams, measuring with chain and compass.

[4][5] When done, the deputy surveyor filed this general description: This Township contains no marshes: There is a Tamarac Swamp in the SouthEast corner unfit for cultivation.

The Surface is generally level rather more than half of it is covered with Hardwood timber Where the soil is 1st and 2nd rate.

Black Ash Tamarac and Birch: the more elevated land produces Sugar-Maple White(?)