Last official estimated population of Middlesex County was 165,625 (year 2014)[1]. This was 0.052% of total US population and 4.6% of total Connecticut state population. Area of Middlesex County is 439.1 mi² (=1137.2 km²), in this year population density was 377.22 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Middlesex County population in 2026 would be 165,472 [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] +0.51 %/yr
[1800-1810] +0.43 %/yr
[1810-1820] +0.78 %/yr
[1820-1830] +1.04 %/yr
[1830-1840] +0.01 %/yr
[1840-1850] +0.9 %/yr
[1850-1860] +1.26 %/yr
[1860-1870] +1.58 %/yr
[1870-1880] -0.14 %/yr
[1880-1890] +1.05 %/yr
[1890-1900] +0.55 %/yr
[1900-1910] +0.89 %/yr
[1910-1920] +0.41 %/yr
[1920-1930] +0.78 %/yr
[1930-1940] +0.86 %/yr
[1940-1950] +1.86 %/yr
[1950-1960] +2.81 %/yr
[1960-1970] +2.6 %/yr
[1970-1980] +1.17 %/yr
[1980-1990] +1.05 %/yr
[1990-2000] +0.8 %/yr
[2000-2005] +0.9 %/yr
[2005-2010] +0.43 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Middlesex County? Visit this page: Settlements in Middlesex County, CT
Population of Middlesex County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3764 | 3686 | 7,450 |
| 5 to 9 | 4186 | 4072 | 8,258 |
| 10 to 14 | 4997 | 4812 | 9,809 |
| 15 to 19 | 5603 | 5285 | 10,888 |
| 20 to 24 | 5108 | 4663 | 9,771 |
| 25 to 29 | 4596 | 4424 | 9,020 |
| 30 to 34 | 4494 | 4651 | 9,145 |
| 35 to 39 | 4209 | 4353 | 8,562 |
| 40 to 44 | 5057 | 5428 | 10,485 |
| 45 to 49 | 6231 | 6544 | 12,775 |
| 50 to 54 | 6961 | 7302 | 14,263 |
| 55 to 59 | 6814 | 6922 | 13,736 |
| 60 to 64 | 5582 | 6008 | 11,590 |
| 65 to 69 | 4624 | 4896 | 9,520 |
| 70 to 74 | 3173 | 3739 | 6,912 |
| 75 to 79 | 2047 | 2536 | 4,583 |
| 80 to 84 | 1505 | 2098 | 3,603 |
| 85+ | 1525 | 3048 | 4,573 |
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 | 75723 | 79706 | 155,429 |
| WAC | 73367 | 76871 | 150,238 |
| WA | 72005 | 75453 | 147,458 |
| NHWAC | 69299 | 72753 | 142,052 |
| NHWA | 68090 | 71523 | 139,613 |
| BAC | 5128 | 5371 | 10,499 |
| H | 4753 | 4761 | 9,514 |
| NHBAC | 4497 | 4740 | 9,237 |
| BA | 4367 | 4555 | 8,922 |
| HWAC | 4068 | 4118 | 8,186 |
| NHBA | 3854 | 4059 | 7,913 |
| HWA | 3915 | 3930 | 7,845 |
| AAC | 2845 | 3141 | 5,986 |
| NHAAC | 2755 | 3067 | 5,822 |
| AA | 2338 | 2652 | 4,990 |
| NHAA | 2277 | 2610 | 4,887 |
| TOM | 1513 | 1565 | 3,078 |
| NHTOM | 1337 | 1353 | 2,690 |
| HBAC | 631 | 631 | 1,262 |
| IAC | 581 | 574 | 1,155 |
| HBA | 513 | 496 | 1,009 |
| NHIAC | 465 | 449 | 914 |
| HTOM | 176 | 212 | 388 |
| IA | 195 | 183 | 378 |
| NAC | 138 | 149 | 287 |
| NHIA | 129 | 124 | 253 |
| HIAC | 116 | 125 | 241 |
| NHNAC | 101 | 112 | 213 |
| HAAC | 90 | 74 | 164 |
| HIA | 66 | 59 | 125 |
| NA | 58 | 59 | 117 |
| HAA | 61 | 42 | 103 |
| HNAC | 37 | 37 | 74 |
| NHNA | 36 | 37 | 73 |
| HNA | 22 | 22 | 44 |
• Suffolk County population
34.9 mi, 
194°
• Fairfield County
46 mi, 
252°
• Hartford County
28 mi, 
337°
• New Haven County
20.4 mi, 253°
• Hampden County
48.9 mi, 
353°
• New London County
21.6 mi, 
82°
• Litchfield County
44.4 mi, 
303°
• Tolland County
30.8 mi, 
17°
• Washington County
47 mi, 
92°
• Windham County
38.6 mi, 
45°
[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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