Last official estimated population of Plymouth County was 495,856 (year 2014)[1]. This was 0.156% of total US population and 7.3% of total Massachusetts state population. Area of Plymouth County is 1,093.3 mi² (=2831.5 km²), in this year population density was 453.56 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Plymouth County population in 2026 would be 498,678 [0].
Historical population of Plymouth County for period 1790-2014 [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
[1790-1800] +0.18 %/yr
[1800-1810] +1.58 %/yr
[1810-1820] +0.81 %/yr
[1820-1830] +1.22 %/yr
[1830-1840] +0.96 %/yr
[1840-1850] +1.63 %/yr
[1850-1860] +1.52 %/yr
[1860-1870] +0.09 %/yr
[1870-1880] +1.25 %/yr
[1880-1890] +2.28 %/yr
[1890-1900] +2.09 %/yr
[1900-1910] +2.39 %/yr
[1910-1920] +0.84 %/yr
[1920-1930] +0.34 %/yr
[1930-1940] +0.39 %/yr
[1940-1950] +1.16 %/yr
[1950-1960] +2.75 %/yr
[1960-1970] +2.98 %/yr
[1970-1980] +1.98 %/yr
[1980-1990] +0.71 %/yr
[1990-2000] +0.83 %/yr
[2000-2005] +0.56 %/yr
[2005-2010] +0.35 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Plymouth County? Visit this page: Settlements in Plymouth County, MA
Population of Plymouth County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 13921 | 12978 | 26,899 |
| 5 to 9 | 16013 | 14849 | 30,862 |
| 10 to 14 | 17788 | 16886 | 34,674 |
| 15 to 19 | 17579 | 17028 | 34,607 |
| 20 to 24 | 15829 | 15423 | 31,252 |
| 25 to 29 | 13252 | 12790 | 26,042 |
| 30 to 34 | 12879 | 13655 | 26,534 |
| 35 to 39 | 13540 | 14195 | 27,735 |
| 40 to 44 | 16257 | 17409 | 33,666 |
| 45 to 49 | 19086 | 20092 | 39,178 |
| 50 to 54 | 20301 | 21316 | 41,617 |
| 55 to 59 | 18612 | 19895 | 38,507 |
| 60 to 64 | 15720 | 17425 | 33,145 |
| 65 to 69 | 13153 | 15118 | 28,271 |
| 70 to 74 | 9281 | 10849 | 20,130 |
| 75 to 79 | 5864 | 7385 | 13,249 |
| 80 to 84 | 4044 | 5684 | 9,728 |
| 85+ | 3473 | 7453 | 10,926 |
Plymouth 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 | 237172 | 251368 | 488,540 |
| WAC | 216803 | 228781 | 445,584 |
| WA | 212909 | 224833 | 437,742 |
| NHWAC | 209465 | 221718 | 431,183 |
| NHWA | 205965 | 218224 | 424,189 |
| BAC | 27359 | 28537 | 55,896 |
| NHBAC | 25430 | 26536 | 51,966 |
| BA | 24800 | 25881 | 50,681 |
| NHBA | 23181 | 24247 | 47,428 |
| H | 9420 | 9062 | 18,482 |
| HWAC | 7338 | 7063 | 14,401 |
| HWA | 6944 | 6609 | 13,553 |
| AAC | 4514 | 5327 | 9,841 |
| NHAAC | 4404 | 5197 | 9,601 |
| TOM | 4431 | 4533 | 8,964 |
| NHTOM | 3985 | 4015 | 8,000 |
| AA | 3296 | 4102 | 7,398 |
| NHAA | 3240 | 4030 | 7,270 |
| IAC | 2003 | 2049 | 4,052 |
| HBAC | 1929 | 2001 | 3,930 |
| NHIAC | 1679 | 1720 | 3,399 |
| HBA | 1619 | 1634 | 3,253 |
| IA | 782 | 791 | 1,573 |
| NAC | 634 | 564 | 1,198 |
| NHIA | 591 | 605 | 1,196 |
| HTOM | 446 | 518 | 964 |
| NHNAC | 439 | 482 | 921 |
| NA | 374 | 290 | 664 |
| HIAC | 324 | 329 | 653 |
| NHNA | 210 | 247 | 457 |
| HIA | 191 | 186 | 377 |
| HNAC | 195 | 82 | 277 |
| HAAC | 110 | 130 | 240 |
| HNA | 164 | 43 | 207 |
| HAA | 56 | 72 | 128 |
• Middlesex County population
47.8 mi, 
315°
• Essex County
45.7 mi, 
352°
• Suffolk County
27.8 mi, 
329°
• Norfolk County
25.9 mi, 
299°
• Providence County
43.8 mi, 
259°
• Bristol County
24.4 mi, 
227°
• Barnstable County
30.2 mi, 
115°
• Newport County
43.6 mi, 
219°
• Bristol County
34.4 mi, 234°
• Dukes County
41.9 mi, 
177°
[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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