Williston, ND -- U.S. city in North Dakota Population (2000): 12512 Housing Units (2000): 5912 Land area (2000): 6.973962 sq. miles (18.062477 sq. km) Water area (2000): 0.065608 sq. miles (0.169923 sq. km) Total area (2000): 7.039570 sq. miles (18.232400 sq. km) FIPS code: 86220 Located within: North Dakota (ND), FIPS 38 Location: 48.156477 N, 103.628064 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Williston, ND Williston