Population of Counties in North Dakota (2021)

There are 53 counties in North Dakota. The most populous county in the state is Cass County, which is the only county to have over 100,000 people in North Dakota with 181,516. Fargo, the state’s most populous city, is in Cass County and accounts for 17% of the state’s population. Cass County comprises about 23.88% of North Dakota’s total population. The second-most populous county in North Dakota is Burleigh County, which has 95,273 residents, followed by Grand Forks County with 70,770 residents. Burleigh County is home to Bismarck, the state’s capital and second-most populous city.

North Dakota Counties with the Fewest Residents

Two North Dakota counties have populations under 1,000 residents. Slope County is the least populous county in North Dakota with 763 residents. Slope County’s population density is just 0.63 persons per square kilometer. Billings County is the second-least populous county in the state with 919 residents and a population density of 0.80 persons per square kilometer. Together, Slope County and Billings County make up only 0.22% of North Dakota’s total population.

The third-least populous state in North Dakota is Sheridan County, which has 1,349 residents.

North Dakota Counties with Rapid Growth

Several counties in North Dakota have experienced double-digit growth, with one county seeing triple-digit growth since 2010. McKenzie County has seen a 112.63% growth since 2010. Despite this, McKenzie County has a population of just 13,632 residents.

Williams County has had the second-highest growth since 2010, growing by 56.50%. This is followed by Mountrail County (32.62%) and Stark County (27.25%). Other counties that have had double-digit growth include Dunn (22.51%), Cass (20.77%), Billings (17.37%), Burleigh (16.61%), and Morton (12.79%).

Name 2021 Population Growth Since 2010 Density (mi²)
Cass County185,18123.20%111.61
Burleigh County96,32617.90%58.06
Grand Forks County67,6430.97%40.77
Ward County67,4978.65%40.68
Williams County41,82985.17%25.21
Stark County32,68134.16%19.70
Morton County31,97615.98%19.27
Stutsman County20,362-3.67%12.27
McKenzie County17,884178.91%10.78
Richland County16,073-1.56%9.69
Rolette County13,830-1.26%8.34
Ramsey County11,397-0.46%6.87
Mountrail County11,15744.75%6.72
Walsh County10,633-4.33%6.41
Barnes County10,191-7.90%6.14
McLean County9,2923.27%5.60
Traill County8,068-0.46%4.86
Mercer County8,029-4.63%4.84
Pembina County6,613-10.66%3.99
Benson County6,580-1.45%3.97
Bottineau County6,050-6.06%3.65
McHenry County5,6194.02%3.39
Ransom County5,206-4.30%3.14
Dickey County4,754-9.93%2.87
Dunn County4,61630.54%2.78
Sargent County3,9924.72%2.41
LaMoure County3,988-3.44%2.40
Sioux County3,936-5.11%2.37
Pierce County3,785-13.19%2.28
Wells County3,686-12.07%2.22
Cavalier County3,664-8.10%2.21
Foster County3,216-3.80%1.94
Emmons County3,167-10.31%1.91
Bowman County2,938-6.52%1.77
Nelson County2,867-8.14%1.73
Kidder County2,5343.56%1.53
Hettinger County2,4910.61%1.50
McIntosh County2,359-15.75%1.42
Renville County2,265-8.82%1.37
Divide County2,2648.85%1.36
Eddy County2,243-5.95%1.35
Griggs County2,237-7.41%1.35
Towner County2,197-2.05%1.32
Burke County2,1579.44%1.30
Grant County2,114-11.70%1.27
Adams County2,096-10.81%1.26
Oliver County1,9877.93%1.20
Steele County1,886-5.27%1.14
Logan County1,776-11.11%1.07
Golden Valley County1,7574.46%1.06
Sheridan County1,261-4.18%0.76
Billings County94821.07%0.57
Slope County728-0.55%0.44