
Unit B1 - All of Slope County and those portions of Billings and Golden Valley counties south of Interstate 94 except that portion known as Unit B2 (see Unit B2 description).
Unit B2 - Those portions of Billings County starting at the Interstate 94 Fryburg Exit #36, then south to 38th Street, then west to 136th Avenue, then south to 43rd Street--USFS 740, then west to KG Road--USFS 765, then south to Dantz Creek (between Kendley and Moody Plateaus), then west to East River Road (FH3)--USFS 742, then north to USFS 794, then west to Little Missouri River, then north to Garner Creek, then west to West River Road--USFS 745, then north to Old Highway 10, then east to Interstate 94, then east to point of origin.
Unit B3 - Those portions of Golden Valley, Billings, Stark and McKenzie counties starting at a point where Interstate 94 enters North Dakota, then following Interstate 94 east to U.S. Highway 85, then north to McKenzie County Road 50, then west to McKenzie County Road 27--Red Wing Road, then north to McKenzie County Road 38--Hay Draw Road, then west and north to Montana State Line, then south to point of origin.
Unit B4 - Those portions of McKenzie and Dunn counties starting at the intersection of McKenzie County Road 38--Hay Draw Road and the Montana State Line, then south and east to McKenzie County Road 27--Red Wing Road, then south and east to McKenzie County Road 50, then east to U.S. Highway 85, then south to ND Highway 200, then east to ND Highway 22, then north to McKenzie County Road 53, then west and north to ND Highway 23 (excluding area within Fort Berthold Indian Reservation), then west to U.S. Highway 85, then west and north to the south bank of the Missouri River (Lake Sakakawea), then west along the south bank of the Missouri River to the Montana State line, then south to the point of origin.

Unit E1 - Cavalier, Pembina, and Walsh counties, and those portions of Rolette and Towner counties north of ND Highway 66 and east of ND Highway 30.
Unit E2 - McKenzie and Dunn counties, excluding all of Theodore Roosevelt National Park.
Unit E3 - Billings, Golden Valley and Slope counties. Except that portion of Unit E4 in Billings and Golden Valley counties and Theodore Roosevelt National Park.
Unit E4 - An area in Billings and Golden Valley counties north of Interstate 94, excluding all of Theodore Roosevelt National Park. Composed of land in the following:
Unit E5--The remainder of the state not included in a numbered unit.

Unit M1c - CLOSED in 2011. Those portions of Cavalier, Pembina, Ramsey, and Walsh counties bordered on the east by Minnesota, on the north by Canada, on the west by ND Highway 1 and on the south by ND Highway 17.
Unit M4 - Those portions of Bottineau and Rolette counties bordered on the west by ND Highway 14, on the south by ND Highway 5, on the east by ND Highway 30, and on the north by Canada.
Unit M5 - Those portions of Grand Forks, Nelson, Ramsey, and Walsh counties bordered on the north by ND Highway 17, on the west by ND Highway 1, on the south by U.S. Highway 2, and on the east by Minnesota.
Unit M6 - Those portions of Barnes, Benson, Cass, Dickey, Eddy, Foster, Grand Forks, Griggs, LaMoure, Nelson, Ramsey, Ransom, Richland, Sargent, Steele, Stutsman, and Traill counties bordered on the west by U.S. Highway 281, on the north by U.S. Highway 2, on the east by Minnesota, and on the south by South Dakota.
Unit M8 - Those portions of Bottineau, Cavalier, Pierce, Ramsey, Rolette, and Towner counties bordered on the east by ND Highway 1, on the north by Canada and Unit M4, on the west by ND Highway 60, and on the south by ND Highway 17.
Unit M9 - Those portions of Benson, Bottineau, McHenry, McLean, Towner, Pierce, Ramsey, Renville, Sheridan, Ward and Wells counties bordered on the east by ND Highway 1 and Unit M6, on the north by Unit M8, Unit M4 and Canada. The western and southern borders are composed of ND Highway 256 and U.S. Highway 83 to the point where the highway crosses the southern portion of Lake Sakakawea, then west along Lake Sakakawea and south along the Missouri River to Washburn, then north on ND Highway 200A, then east on ND Highway 200 to the junction of U.S. Highway 281 at Carrington. Mallard Island is included within this unit.
Unit M10 - Those portions of Bottineau, Burke, Divide, McLean, Mountrail, Renville, Ward and Williams counties, bordered on the east by Unit M9, the north by Canada and the west by Montana. The southern border starts at the junction of Montana and U.S. Highway 2 and continues east along U.S. Highway 2 to Williston where it meets up with ND Highway 1804, then continues east along ND Highway 1804 to New Town, then follows ND Highway 23 west to the shore of Lake Sakakawea, then following the north shore of Lake Sakakawea to U.S. Highway 83 (Unit M9).
Unit M11 - Those portions of Dunn, McKenzie, Mercer, Mountrail and Williams counties bordered on the west by Montana, on the north and east by Units M9 and M10, and on the south by a line starting along ND Highway 200 at the Montana border, eastward to U.S. Highway 85, then south along U.S. Highway 85 to ND Highway 200, then continuing along ND Highway 200 to the Missouri River east of Pick City (Unit M9).