Last official estimated population of Marion County was 315,910 (year 2014)[1]. This was 0.099% of total US population and 7.8% of total Oregon state population. Area of Marion County is 1,191.3 mi² (=3085.4 km²), in this year population density was 265.18 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Marion County population in 2025 would be 317,497 [0].
Historical population of Marion County for period 1850-2014 [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
[1850-1860] +9.93 %/yr
[1860-1870] +3.47 %/yr
[1870-1880] +3.88 %/yr
[1880-1890] +4.64 %/yr
[1890-1900] +1.91 %/yr
[1900-1910] +3.68 %/yr
[1910-1920] +1.72 %/yr
[1920-1930] +2.52 %/yr
[1930-1940] +2.2 %/yr
[1940-1950] +3.03 %/yr
[1950-1960] +1.77 %/yr
[1960-1970] +2.27 %/yr
[1970-1980] +3.07 %/yr
[1980-1990] +1.11 %/yr
[1990-2000] +2.23 %/yr
[2000-2005] +1.01 %/yr
[2005-2010] +1.04 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Marion County? Visit this page: Settlements in Marion County, OR
Population of Marion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 11521 | 10723 | 22,244 |
| 5 to 9 | 12189 | 11626 | 23,815 |
| 10 to 14 | 11641 | 11263 | 22,904 |
| 15 to 19 | 11909 | 11056 | 22,965 |
| 20 to 24 | 11576 | 11042 | 22,618 |
| 25 to 29 | 11235 | 10661 | 21,896 |
| 30 to 34 | 11340 | 10803 | 22,143 |
| 35 to 39 | 10571 | 10004 | 20,575 |
| 40 to 44 | 10410 | 9816 | 20,226 |
| 45 to 49 | 9907 | 9453 | 19,360 |
| 50 to 54 | 10306 | 10388 | 20,694 |
| 55 to 59 | 9998 | 10598 | 20,596 |
| 60 to 64 | 9065 | 10040 | 19,105 |
| 65 to 69 | 7545 | 8262 | 15,807 |
| 70 to 74 | 5151 | 6103 | 11,254 |
| 75 to 79 | 3554 | 4244 | 7,798 |
| 80 to 84 | 2379 | 3267 | 5,646 |
| 85+ | 2289 | 4175 | 6,464 |
Marion 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 | 150362 | 151793 | 302,155 |
| WA | 145349 | 146728 | 292,077 |
| NH | 118853 | 123490 | 242,343 |
| NHWAC | 110480 | 115266 | 225,746 |
| NHWA | 106784 | 111383 | 218,167 |
| H | 43733 | 40034 | 83,767 |
| HWAC | 39882 | 36527 | 76,409 |
| HWA | 38565 | 35345 | 73,910 |
| IAC | 6865 | 6695 | 13,560 |
| AAC | 5031 | 5669 | 10,700 |
| TOM | 5303 | 5342 | 10,645 |
| NHAAC | 4331 | 5030 | 9,361 |
| IA | 4300 | 4023 | 8,323 |
| NHTOM | 3891 | 4073 | 7,964 |
| BAC | 4192 | 3206 | 7,398 |
| AA | 3366 | 4013 | 7,379 |
| NHIAC | 3384 | 3579 | 6,963 |
| NHAA | 2997 | 3684 | 6,681 |
| HIAC | 3481 | 3116 | 6,597 |
| NHBAC | 3166 | 2231 | 5,397 |
| HIA | 2602 | 2318 | 4,920 |
| BA | 2808 | 1877 | 4,685 |
| NAC | 2057 | 2115 | 4,172 |
| NHNAC | 1797 | 1879 | 3,676 |
| NHIA | 1698 | 1705 | 3,403 |
| NHBA | 2140 | 1229 | 3,369 |
| NA | 1460 | 1541 | 3,001 |
| NHNA | 1343 | 1416 | 2,759 |
| HTOM | 1412 | 1269 | 2,681 |
| HBAC | 1026 | 975 | 2,001 |
| HAAC | 700 | 639 | 1,339 |
| HBA | 668 | 648 | 1,316 |
| HAA | 369 | 329 | 698 |
| HNAC | 260 | 236 | 496 |
| HNA | 117 | 125 | 242 |
• Multnomah County population
45.4 mi, 
9°
• Washington County
51.7 mi, 
330°
• Clark County
60.3 mi, 
4°
• Clackamas County
25.8 mi, 
46°
• Linn County
28.5 mi, 
176°
• Yamhill County
43.3 mi, 
303°
• Benton County
50.3 mi, 
235°
• Polk County
40.2 mi, 
269°
• Lincoln County
67.9 mi, 
254°
• Hood River County
61.5 mi, 46°
[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
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