A majority of North Dakota counties are located in the Central Time Zone, with 8 counties in the  southwest following Mountain Time.

The counties which observe MST are as follows:
 Bowman County
 Adams County
 Slope County
 Hettinger County
 Grant County
 Stark County
 Billings County
 Golden Valley County
 Parts of Sioux County, Dunn County, and McKenzie County

IANA time zone database
In the IANA time zone database, North Dakota is covered by five time zones, columns marked "*" contain the data from the file zone.tab:

References

See also
 Time in the United States

North Dakota
Geography of North Dakota