Last official estimated population of Middlesex County was 1,506,852 (year 2014)[1]. This was 0.473% of total US population and 22.2% of total Massachusetts state population. Area of Middlesex County is 847.1 mi² (=2193.9 km²), in this year population density was 1,778.92 p/mi². If population growth rate would be same as in period 2010-2014 (+0.06%/yr), Middlesex County population in 2026 would be 1,518,210 [0].
Historical population of Middlesex 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] +0.94 %/yr
[1800-1810] +1.18 %/yr
[1810-1820] +1.53 %/yr
[1820-1830] +2.4 %/yr
[1830-1840] +3.18 %/yr
[1840-1850] +4.23 %/yr
[1850-1860] +2.97 %/yr
[1860-1870] +2.4 %/yr
[1870-1880] +1.48 %/yr
[1880-1890] +3.1 %/yr
[1890-1900] +2.75 %/yr
[1900-1910] +1.71 %/yr
[1910-1920] +1.51 %/yr
[1920-1930] +1.85 %/yr
[1930-1940] +0.38 %/yr
[1940-1950] +0.92 %/yr
[1950-1960] +1.53 %/yr
[1960-1970] +1.21 %/yr
[1970-1980] -0.22 %/yr
[1980-1990] +0.23 %/yr
[1990-2000] +0.47 %/yr
[2000-2005] -0.14 %/yr
[2005-2010] +0.65 %/yr
[2010-2014] +0.06 %/yr
Looking for settlements in Middlesex County? Visit this page: Settlements in Middlesex County, MA
Population of Middlesex County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 44896 | 43197 | 88,093 |
| 5 to 9 | 44788 | 42841 | 87,629 |
| 10 to 14 | 46279 | 44668 | 90,947 |
| 15 to 19 | 52385 | 50216 | 102,601 |
| 20 to 24 | 54105 | 52140 | 106,245 |
| 25 to 29 | 60601 | 60598 | 121,199 |
| 30 to 34 | 58826 | 57997 | 116,823 |
| 35 to 39 | 51427 | 52256 | 103,683 |
| 40 to 44 | 51924 | 53153 | 105,077 |
| 45 to 49 | 54783 | 57379 | 112,162 |
| 50 to 54 | 58040 | 60423 | 118,463 |
| 55 to 59 | 52164 | 55798 | 107,962 |
| 60 to 64 | 42551 | 46743 | 89,294 |
| 65 to 69 | 33189 | 37910 | 71,099 |
| 70 to 74 | 22212 | 27168 | 49,380 |
| 75 to 79 | 15845 | 20745 | 36,590 |
| 80 to 84 | 11796 | 17287 | 29,083 |
| 85+ | 11142 | 22843 | 33,985 |
Middlesex 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 | 707373 | 744838 | 1,452,211 |
| WAC | 635700 | 666952 | 1,302,652 |
| WA | 619891 | 651271 | 1,271,162 |
| NHWAC | 583087 | 615463 | 1,198,550 |
| NHWA | 569608 | 602011 | 1,171,619 |
| AAC | 93625 | 97530 | 191,155 |
| NHAAC | 92341 | 96210 | 188,551 |
| AA | 84844 | 88894 | 173,738 |
| NHAA | 84136 | 88115 | 172,251 |
| H | 59580 | 58524 | 118,104 |
| HWAC | 52613 | 51489 | 104,102 |
| BAC | 49436 | 50767 | 100,203 |
| HWA | 50283 | 49260 | 99,543 |
| NHBAC | 43169 | 44408 | 87,577 |
| BA | 42544 | 43734 | 86,278 |
| NHBA | 37926 | 39013 | 76,939 |
| TOM | 17074 | 17007 | 34,081 |
| NHTOM | 14551 | 14578 | 29,129 |
| HBAC | 6267 | 6359 | 12,626 |
| IAC | 5107 | 5060 | 10,167 |
| HBA | 4618 | 4721 | 9,339 |
| NHIAC | 3244 | 3341 | 6,585 |
| HTOM | 2523 | 2429 | 4,952 |
| IA | 2050 | 1956 | 4,006 |
| HIAC | 1863 | 1719 | 3,582 |
| NAC | 1347 | 1267 | 2,614 |
| HAAC | 1284 | 1320 | 2,604 |
| HIA | 1160 | 1056 | 2,216 |
| NHNAC | 922 | 884 | 1,806 |
| NHIA | 890 | 900 | 1,790 |
| HAA | 708 | 779 | 1,487 |
| NA | 550 | 500 | 1,050 |
| HNAC | 425 | 383 | 808 |
| HNA | 288 | 279 | 567 |
| NHNA | 262 | 221 | 483 |
• Worcester County population
30.2 mi, 
247°
• Essex County
29.2 mi, 
67°
• Suffolk County
21.7 mi, 
118°
• Norfolk County
24 mi, 
152°
• Providence County
43.3 mi, 
192°
• Bristol County
53.1 mi, 
162°
• Plymouth County
47.8 mi, 
135°
• Hillsborough County
34.1 mi, 
330°
• Rockingham County
38.1 mi, 
23°
• Cheshire County
53.1 mi, 
305°
[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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