Last official estimated population of Kittitas County was 41,011 (year 2014)[1]. This was 0.013% of total US population and 0.6% of total Washington state population. Area of Kittitas County is 2,333.2 mi² (=6043.1 km²), in this year population density was 17.58 p/mi². If population growth rate would be same as in period 2010-2014 (+0.06%/yr), Kittitas County population in 2024 would be 41,252 [0].
Historical population of Kittitas County for period 1890-2014 [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
[1890-1900] +1.01 %/yr
[1900-1910] +6.7 %/yr
[1910-1920] -0.45 %/yr
[1920-1930] +0.23 %/yr
[1930-1940] +1.09 %/yr
[1940-1950] +0.95 %/yr
[1950-1960] -0.83 %/yr
[1960-1970] +2.04 %/yr
[1970-1980] -0.06 %/yr
[1980-1990] +0.72 %/yr
[1990-2000] +2.25 %/yr
[2000-2005] +2.38 %/yr
[2005-2010] +1.74 %/yr
[2010-2014] +0.06 %/yr
Looking for settlements in Kittitas County? Visit this page: Settlements in Kittitas County, WA
Population of Kittitas County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1121 | 1008 | 2,129 |
| 5 to 9 | 1051 | 1110 | 2,161 |
| 10 to 14 | 1041 | 1065 | 2,106 |
| 15 to 19 | 1735 | 1850 | 3,585 |
| 20 to 24 | 3668 | 3619 | 7,287 |
| 25 to 29 | 1577 | 1226 | 2,803 |
| 30 to 34 | 1189 | 1042 | 2,231 |
| 35 to 39 | 1076 | 996 | 2,072 |
| 40 to 44 | 1029 | 1059 | 2,088 |
| 45 to 49 | 1086 | 1073 | 2,159 |
| 50 to 54 | 1230 | 1259 | 2,489 |
| 55 to 59 | 1318 | 1328 | 2,646 |
| 60 to 64 | 1281 | 1288 | 2,569 |
| 65 to 69 | 1082 | 1101 | 2,183 |
| 70 to 74 | 811 | 825 | 1,636 |
| 75 to 79 | 539 | 517 | 1,056 |
| 80 to 84 | 281 | 314 | 595 |
| 85+ | 266 | 461 | 727 |
Kittitas 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 |
| WAC | 20317 | 20019 | 40,336 |
| WA | 19676 | 19406 | 39,082 |
| NH | 19479 | 19289 | 38,768 |
| NHWAC | 18559 | 18293 | 36,852 |
| NHWA | 18005 | 17812 | 35,817 |
| H | 1902 | 1852 | 3,754 |
| HWAC | 1758 | 1726 | 3,484 |
| HWA | 1671 | 1594 | 3,265 |
| AAC | 708 | 791 | 1,499 |
| NHAAC | 651 | 718 | 1,369 |
| TOM | 692 | 648 | 1,340 |
| IAC | 559 | 556 | 1,115 |
| NHTOM | 597 | 508 | 1,105 |
| AA | 431 | 559 | 990 |
| NHAA | 402 | 520 | 922 |
| NHIAC | 439 | 425 | 864 |
| BAC | 428 | 347 | 775 |
| NHBAC | 369 | 292 | 661 |
| IA | 260 | 272 | 532 |
| BA | 285 | 208 | 493 |
| NHBA | 246 | 181 | 427 |
| NHIA | 196 | 221 | 417 |
| HIAC | 120 | 131 | 251 |
| HTOM | 95 | 140 | 235 |
| NAC | 94 | 94 | 188 |
| NHNAC | 84 | 84 | 168 |
| HAAC | 57 | 73 | 130 |
| HIA | 64 | 51 | 115 |
| HBAC | 59 | 55 | 114 |
| NA | 37 | 48 | 85 |
| NHNA | 33 | 47 | 80 |
| HAA | 29 | 39 | 68 |
| HBA | 39 | 27 | 66 |
| HNAC | 10 | 10 | 20 |
| HNA | 4 | 1 | 5 |
• King County population
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[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
*Yakima Washington Notes
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