Last official estimated population of Middlesex County was 811,272 (year 2014)[1]. This was 0.254% of total US population and 9.1% of total New Jersey state population. Area of Middlesex County is 322.8 mi² (=836.1 km²), in this year population density was 2,513.07 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Middlesex County population in 2024 would be 814,818 [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] +1.15 %/yr
[1800-1810] +1.31 %/yr
[1810-1820] +0.52 %/yr
[1820-1830] +0.76 %/yr
[1830-1840] -0.56 %/yr
[1840-1850] +2.72 %/yr
[1850-1860] +1.97 %/yr
[1860-1870] +2.61 %/yr
[1870-1880] +1.51 %/yr
[1880-1890] +1.68 %/yr
[1890-1900] +2.59 %/yr
[1900-1910] +3.67 %/yr
[1910-1920] +3.56 %/yr
[1920-1930] +2.72 %/yr
[1930-1940] +0.23 %/yr
[1940-1950] +2.01 %/yr
[1950-1960] +5.06 %/yr
[1960-1970] +3.01 %/yr
[1970-1980] +0.21 %/yr
[1980-1990] +1.2 %/yr
[1990-2000] +1.11 %/yr
[2000-2005] +0.97 %/yr
[2005-2010] +0.57 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Middlesex County? Visit this page: Settlements in Middlesex County, NJ
Population of Middlesex County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 25893 | 24477 | 50,370 |
| 5 to 9 | 25656 | 25168 | 50,824 |
| 10 to 14 | 26410 | 25041 | 51,451 |
| 15 to 19 | 29250 | 26695 | 55,945 |
| 20 to 24 | 28661 | 28387 | 57,048 |
| 25 to 29 | 29877 | 28997 | 58,874 |
| 30 to 34 | 29462 | 29432 | 58,894 |
| 35 to 39 | 28976 | 28767 | 57,743 |
| 40 to 44 | 29840 | 29232 | 59,072 |
| 45 to 49 | 29351 | 29759 | 59,110 |
| 50 to 54 | 30075 | 31222 | 61,297 |
| 55 to 59 | 27854 | 29352 | 57,206 |
| 60 to 64 | 22373 | 24083 | 46,456 |
| 65 to 69 | 17018 | 19325 | 36,343 |
| 70 to 74 | 11571 | 14157 | 25,728 |
| 75 to 79 | 8080 | 10723 | 18,803 |
| 80 to 84 | 5667 | 8987 | 14,654 |
| 85+ | 5725 | 10754 | 16,479 |
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 | 328786 | 341260 | 670,046 |
| WAC | 262494 | 270532 | 533,026 |
| WA | 255504 | 263519 | 519,023 |
| NHWAC | 190542 | 198258 | 388,800 |
| NHWA | 185853 | 193636 | 379,489 |
| AAC | 103905 | 104474 | 208,379 |
| NHAAC | 102452 | 102996 | 205,448 |
| AA | 100149 | 100893 | 201,042 |
| NHAA | 99235 | 99978 | 199,213 |
| H | 82953 | 83298 | 166,251 |
| HWAC | 71952 | 72274 | 144,226 |
| HWA | 69651 | 69883 | 139,534 |
| BAC | 48956 | 53522 | 102,478 |
| BA | 44539 | 48780 | 93,319 |
| NHBAC | 39691 | 43865 | 83,556 |
| NHBA | 37066 | 41075 | 78,141 |
| HBAC | 9265 | 9657 | 18,922 |
| TOM | 8460 | 8491 | 16,951 |
| HBA | 7473 | 7705 | 15,178 |
| NHTOM | 5875 | 5786 | 11,661 |
| IAC | 4848 | 4604 | 9,452 |
| HIAC | 2840 | 2612 | 5,452 |
| HTOM | 2585 | 2705 | 5,290 |
| IA | 2692 | 2437 | 5,129 |
| NHIAC | 2008 | 1992 | 4,000 |
| HIA | 2045 | 1777 | 3,822 |
| HAAC | 1453 | 1478 | 2,931 |
| HAA | 914 | 915 | 1,829 |
| NAC | 761 | 804 | 1,565 |
| NHIA | 647 | 660 | 1,307 |
| NA | 395 | 438 | 833 |
| HNAC | 387 | 405 | 792 |
| NHNAC | 374 | 399 | 773 |
| HNA | 285 | 313 | 598 |
| NHNA | 110 | 125 | 235 |
• Kings County population
27.5 mi, 
60°
• Essex County
25.5 mi, 
19°
• Hudson County
26.5 mi, 
40°
• Monmouth County
17.1 mi, 
128°
• Union County
16.1 mi, 18°
• Morris County
29.9 mi, 
345°
• Richmond County
16.4 mi, 59°
• Mercer County
19 mi, 
235°
• Somerset County
14.1 mi, 
307°
• Hunterdon County
27.9 mi, 
288°
[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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