Last official estimated population of Franklin County was 79,122 (year 2014)[1]. This was 0.025% of total US population and 1.1% of total Washington state population. Area of Franklin County is 1,265.3 mi² (=3277.1 km²), in this year population density was 62.53 p/mi². If population growth rate would be same as in period 2010-2014 (+0.31%/yr), Franklin County population in 2025 would be 81,820 [0].
Historical population of Franklin 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] -3.53 %/yr
[1900-1910] +26.63 %/yr
[1910-1920] +1.32 %/yr
[1920-1930] +0.43 %/yr
[1930-1940] +0.27 %/yr
[1940-1950] +7.96 %/yr
[1950-1960] +5.58 %/yr
[1960-1970] +1.01 %/yr
[1970-1980] +3.1 %/yr
[1980-1990] +0.68 %/yr
[1990-2000] +2.8 %/yr
[2000-2005] +4.44 %/yr
[2005-2010] +4.96 %/yr
[2010-2014] +0.31 %/yr
Looking for settlements in Franklin County? Visit this page: Settlements in Franklin County, WA
Population of Franklin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4416 | 4328 | 8,744 |
| 5 to 9 | 4347 | 4302 | 8,649 |
| 10 to 14 | 4002 | 3778 | 7,780 |
| 15 to 19 | 3370 | 3218 | 6,588 |
| 20 to 24 | 3328 | 2871 | 6,199 |
| 25 to 29 | 3679 | 3154 | 6,833 |
| 30 to 34 | 3948 | 3314 | 7,262 |
| 35 to 39 | 3345 | 2971 | 6,316 |
| 40 to 44 | 2909 | 2535 | 5,444 |
| 45 to 49 | 2585 | 2160 | 4,745 |
| 50 to 54 | 2268 | 2118 | 4,386 |
| 55 to 59 | 2190 | 1983 | 4,173 |
| 60 to 64 | 1929 | 1806 | 3,735 |
| 65 to 69 | 1265 | 1304 | 2,569 |
| 70 to 74 | 855 | 873 | 1,728 |
| 75 to 79 | 552 | 605 | 1,157 |
| 80 to 84 | 334 | 437 | 771 |
| 85+ | 277 | 453 | 730 |
Franklin 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 | 42260 | 39433 | 81,693 |
| WA | 41394 | 38431 | 79,825 |
| H | 23579 | 21953 | 45,532 |
| HWAC | 22555 | 20973 | 43,528 |
| HWA | 22228 | 20624 | 42,852 |
| NH | 22020 | 20257 | 42,277 |
| NHWAC | 19705 | 18460 | 38,165 |
| NHWA | 19166 | 17807 | 36,973 |
| BAC | 1781 | 1366 | 3,147 |
| AAC | 1187 | 1326 | 2,513 |
| BA | 1444 | 977 | 2,421 |
| NHBAC | 1337 | 898 | 2,235 |
| NHAAC | 1004 | 1094 | 2,098 |
| TOM | 983 | 1111 | 2,094 |
| IAC | 1087 | 988 | 2,075 |
| AA | 887 | 983 | 1,870 |
| NHBA | 1128 | 641 | 1,769 |
| NHAA | 781 | 852 | 1,633 |
| NHTOM | 612 | 720 | 1,332 |
| IA | 693 | 540 | 1,233 |
| HIAC | 639 | 556 | 1,195 |
| HBAC | 444 | 468 | 912 |
| NHIAC | 448 | 432 | 880 |
| HIA | 446 | 363 | 809 |
| HTOM | 371 | 391 | 762 |
| HBA | 316 | 336 | 652 |
| NAC | 305 | 280 | 585 |
| NHIA | 247 | 177 | 424 |
| HAAC | 183 | 232 | 415 |
| NA | 198 | 168 | 366 |
| HNAC | 149 | 159 | 308 |
| NHNAC | 156 | 121 | 277 |
| HAA | 106 | 131 | 237 |
| HNA | 112 | 108 | 220 |
| NHNA | 86 | 60 | 146 |
• Benton County population
36 mi,
233°
• Grant County
53.9 mi,
330°
• Umatilla County
65.7 mi,
172°
• Walla Walla County
28.1 mi,
133°
• Whitman County
69.8 mi,
68°
• Adams County
37.8 mi,
29°
• Morrow County
83.6 mi,
203°
• Lincoln County
76 mi,
17°
• Columbia County
50.3 mi,
109°
• Garfield County
65.6 mi,
96°
[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
*Whitman Washington Notes
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