Last official estimated population of Suffolk County was 725,319 (year 2014)[1]. This was 0.227% of total US population and 10.7% of total Massachusetts state population. Area of Suffolk County is 120.2 mi² (=311.4 km²), in this year population density was 6,033.26 p/mi². If population growth rate would be same as in period 2010-2014 (+0.11%/yr), Suffolk County population in 2025 would be 734,461 [0].
Historical population of Suffolk 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] -4.6 %/yr
[1800-1810] +2.07 %/yr
[1810-1820] +2.48 %/yr
[1820-1830] +3.53 %/yr
[1830-1840] +4.42 %/yr
[1840-1850] +4.2 %/yr
[1850-1860] +2.92 %/yr
[1860-1870] +3.46 %/yr
[1870-1880] +3.66 %/yr
[1880-1890] +2.25 %/yr
[1890-1900] +2.35 %/yr
[1900-1910] +1.81 %/yr
[1910-1920] +1.34 %/yr
[1920-1930] +0.51 %/yr
[1930-1940] -0.19 %/yr
[1940-1950] +0.38 %/yr
[1950-1960] -1.24 %/yr
[1960-1970] -0.73 %/yr
[1970-1980] -1.22 %/yr
[1980-1990] +0.21 %/yr
[1990-2000] +0.4 %/yr
[2000-2005] -0.13 %/yr
[2005-2010] +1.01 %/yr
[2010-2014] +0.11 %/yr
Looking for settlements in Suffolk County? Visit this page: Settlements in Suffolk County, MA
Population of Suffolk County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 22415 | 21391 | 43,806 |
| 5 to 9 | 17994 | 17641 | 35,635 |
| 10 to 14 | 16725 | 16080 | 32,805 |
| 15 to 19 | 25057 | 27431 | 52,488 |
| 20 to 24 | 38612 | 41076 | 79,688 |
| 25 to 29 | 49098 | 50817 | 99,915 |
| 30 to 34 | 36849 | 37314 | 74,163 |
| 35 to 39 | 26047 | 26048 | 52,095 |
| 40 to 44 | 22773 | 23206 | 45,979 |
| 45 to 49 | 22046 | 22521 | 44,567 |
| 50 to 54 | 21826 | 22615 | 44,441 |
| 55 to 59 | 19767 | 21930 | 41,697 |
| 60 to 64 | 16813 | 18993 | 35,806 |
| 65 to 69 | 12318 | 15144 | 27,462 |
| 70 to 74 | 8587 | 10671 | 19,258 |
| 75 to 79 | 5990 | 8315 | 14,305 |
| 80 to 84 | 4133 | 6682 | 10,815 |
| 85+ | 3906 | 8423 | 12,329 |
Suffolk 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 | 288101 | 312109 | 600,210 |
| WAC | 245930 | 252362 | 498,292 |
| WA | 236622 | 242213 | 478,835 |
| NHWAC | 181443 | 188770 | 370,213 |
| NHWA | 175966 | 182478 | 358,444 |
| BAC | 94868 | 110343 | 205,211 |
| BA | 87386 | 102115 | 189,501 |
| H | 82855 | 84189 | 167,044 |
| NHBAC | 76777 | 89883 | 166,660 |
| NHBA | 72873 | 85327 | 158,200 |
| HWAC | 64487 | 63592 | 128,079 |
| HWA | 60656 | 59735 | 120,391 |
| AAC | 35327 | 39606 | 74,933 |
| NHAAC | 34104 | 38340 | 72,444 |
| AA | 32133 | 36031 | 68,164 |
| NHAA | 31535 | 35387 | 66,922 |
| HBAC | 18091 | 20460 | 38,551 |
| HBA | 14513 | 16788 | 31,301 |
| TOM | 11276 | 12363 | 23,639 |
| NHTOM | 6771 | 7794 | 14,565 |
| IAC | 6108 | 6430 | 12,538 |
| HTOM | 4505 | 4569 | 9,074 |
| HIAC | 3648 | 3569 | 7,217 |
| IA | 2917 | 2940 | 5,857 |
| NHIAC | 2460 | 2861 | 5,321 |
| HIA | 2180 | 2082 | 4,262 |
| NAC | 1355 | 1450 | 2,805 |
| HAAC | 1223 | 1266 | 2,489 |
| NHIA | 737 | 858 | 1,595 |
| NHNAC | 696 | 818 | 1,514 |
| HNAC | 659 | 632 | 1,291 |
| NA | 622 | 636 | 1,258 |
| HAA | 598 | 644 | 1,242 |
| HNA | 403 | 371 | 774 |
| NHNA | 219 | 265 | 484 |
• Middlesex County population
21.7 mi, 
298°
• Worcester County
47 mi, 
268°
• Essex County
22.9 mi, 
20°
• Norfolk County
13.8 mi, 
216°
• Providence County
42.9 mi, 221°
• Bristol County
40.6 mi, 
185°
• Plymouth County
27.8 mi, 
149°
• Hillsborough County
53.7 mi, 
318°
• Rockingham County
45.5 mi, 
354°
• Bristol County
45.7 mi, 
197°
[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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