North Dakota Highway 3 (ND 3) is a 247.530-mile-long (398.361 km) major north–south state highway in North Dakota, United States, that spans the entire state. It travels from South Dakota Highway 45 (SD 45) at the South Dakota state line, south of Ashley north to Manitoba Highway 10 (PTH 10) at the International Peace Garden on the Canada–United States border.

Logan County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 1,876. Its county seat is Napoleon.