A surname. • A placename, from the surname: • A suburb of Perth, Western Australia, Australia; named for Walter Warner Day, a cattle and wine pioneer in the area. • A community in Nova Scotia, Canada. • A number of places in the United States. • A town in Alabama. • A city in Idaho. • A town in Indiana. • A city in Iowa; named for the city in Ohio. • A city in Kentucky; named for the city in Ohio. • A town in Maine; named for Thomas Day, who submitted the petition for the area to become a town. • A city in Minnesota; named for founder Lyman Dayton. • A census-designated place in Montana. • A census-designated place in New Jersey; named for Jonathan Dayton. • A town in New York. • A census-designated place in Lyon County, Nevada, United States; named for John Day, a local surveyor. • A city, the county seat of Montgomery County, Ohio; named for Jonathan Dayton, a Constitution signatory and statesman. • A city in Oregon. • A borough of Pennsylvania. • A city, the county seat of Rhea County, Tennessee; named for the city in Ohio. • A city in Texas. • A town in Virginia. • A city, the county seat of Columbia County, Washington; named for Jesse Day. • A place in Wisconsin. • A town in Richland County, Wisconsin. • A town in Waupaca County, Wisconsin; named for early settler Lyman Dayton. • A town in Wyoming; named for founder Joe Dayton Thorne.