Last official estimated population of Cass County was 150,278 (year 2014)[1]. This was 0.047% of total US population and 19.9% of total North Dakota state population. Area of Cass County is 1,767.9 mi² (=4578.8 km²), in this year population density was 85.00 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Cass County population in 2026 would be 151,788 [0].
Historical population of Cass County for period 1880-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1880-1890] +8.1 %/yr
[1890-1900] +3.85 %/yr
[1900-1910] +1.72 %/yr
[1910-1920] +2.03 %/yr
[1920-1930] +1.63 %/yr
[1930-1940] +0.81 %/yr
[1940-1950] +1.09 %/yr
[1950-1960] +1.29 %/yr
[1960-1970] +0.96 %/yr
[1970-1980] +1.82 %/yr
[1980-1990] +1.55 %/yr
[1990-2000] +1.82 %/yr
[2000-2005] +1.88 %/yr
[2005-2010] +2.07 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Cass County? Visit this page: Settlements in Cass County, ND
Population of Cass County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 5875 | 5697 | 11,572 |
| 5 to 9 | 5576 | 5158 | 10,734 |
| 10 to 14 | 4689 | 4533 | 9,222 |
| 15 to 19 | 5861 | 5530 | 11,391 |
| 20 to 24 | 10645 | 9951 | 20,596 |
| 25 to 29 | 7861 | 6915 | 14,776 |
| 30 to 34 | 7080 | 6434 | 13,514 |
| 35 to 39 | 5851 | 5110 | 10,961 |
| 40 to 44 | 4887 | 4536 | 9,423 |
| 45 to 49 | 4656 | 4464 | 9,120 |
| 50 to 54 | 4888 | 4834 | 9,722 |
| 55 to 59 | 4653 | 4852 | 9,505 |
| 60 to 64 | 4172 | 4249 | 8,421 |
| 65 to 69 | 2962 | 2976 | 5,938 |
| 70 to 74 | 1756 | 1944 | 3,700 |
| 75 to 79 | 1278 | 1699 | 2,977 |
| 80 to 84 | 931 | 1395 | 2,326 |
| 85+ | 978 | 2129 | 3,107 |
Cass County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 82493 | 80497 | 162,990 |
| WAC | 77657 | 76450 | 154,107 |
| WA | 76104 | 74953 | 151,057 |
| NHWAC | 75842 | 74805 | 150,647 |
| NHWA | 74346 | 73399 | 147,745 |
| BAC | 3985 | 3200 | 7,185 |
| NHBAC | 3875 | 3070 | 6,945 |
| BA | 3434 | 2663 | 6,097 |
| NHBA | 3354 | 2579 | 5,933 |
| AAC | 2773 | 2575 | 5,348 |
| NHAAC | 2715 | 2518 | 5,233 |
| AA | 2239 | 2097 | 4,336 |
| NHAA | 2192 | 2068 | 4,260 |
| H | 2106 | 1909 | 4,015 |
| IAC | 1814 | 1770 | 3,584 |
| HWAC | 1815 | 1645 | 3,460 |
| HWA | 1758 | 1554 | 3,312 |
| NHIAC | 1646 | 1594 | 3,240 |
| TOM | 1641 | 1594 | 3,235 |
| NHTOM | 1576 | 1483 | 3,059 |
| IA | 1120 | 1041 | 2,161 |
| NHIA | 993 | 932 | 1,925 |
| HIAC | 168 | 176 | 344 |
| NAC | 142 | 120 | 262 |
| HBAC | 110 | 130 | 240 |
| HIA | 127 | 109 | 236 |
| NHNAC | 105 | 87 | 192 |
| HTOM | 65 | 111 | 176 |
| HBA | 80 | 84 | 164 |
| NA | 61 | 58 | 119 |
| HAAC | 58 | 57 | 115 |
| HAA | 47 | 29 | 76 |
| HNAC | 37 | 33 | 70 |
| NHNA | 32 | 36 | 68 |
| HNA | 29 | 22 | 51 |
• Clay County population
35.8 mi,
93°
• Richland County
48.1 mi,
161°
• Barnes County
38.6 mi,
271°
• Traill County
36.1 mi,
6°
• Norman County
46.3 mi,
53°
• Wilkin County
53.6 mi,
136°
• Ransom County
37.9 mi,
209°
• Sargent County
59.4 mi,
197°
• Griggs County
58.8 mi,
308°
• Steele County
42.3 mi,
328°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Pembina North Dakota Notes
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