Middlesex County, New Jersey Population 2019
Middlesex County, New Jersey's estimated population is 827,684 with a growth rate of 0.22% in the past year according to the most recent United States census data. Middlesex County, New Jersey is the 2nd largest county in New Jersey.
| Year | Population | Growth | Growth Rate |
| 2018 | 829,685 | 2,001 | 0.24% |
| 2017 | 827,684 | 1,777 | 0.22% |
| 2016 | 825,907 | 40 | 0.00% |
| 2015 | 825,867 | 1,518 | 0.18% |
| 2014 | 824,349 | 2,505 | 0.30% |
| 2013 | 821,844 | 2,497 | 0.30% |
| 2012 | 819,347 | 4,265 | 0.52% |
| 2011 | 815,082 | 4,416 | 0.54% |
| 2010 | 810,666 | 138,886 | 20.67% |
| 1990 | 671,780 | 75,887 | 12.74% |
| 1980 | 595,893 | 12,080 | 2.07% |
| 1970 | 583,813 | 149,957 | 34.56% |
| 1960 | 433,856 | 168,984 | 63.80% |
| 1950 | 264,872 | 47,795 | 22.02% |
| 1940 | 217,077 | 4,869 | 2.29% |
| 1930 | 212,208 | 49,874 | 30.72% |
| 1920 | 162,334 | 47,908 | 41.87% |
| 1910 | 114,426 | 34,664 | 43.46% |
| 1900 | 79,762 | 18,008 | 29.16% |
| 1890 | 61,754 | 9,468 | 18.11% |
| 1880 | 52,286 | 7,257 | 16.12% |
| 1870 | 45,029 | 10,217 | 29.35% |
| 1860 | 34,812 | 6,177 | 21.57% |
| 1850 | 28,635 | 6,742 | 30.80% |
| 1840 | 21,893 | -1,264 | -5.46% |
| 1830 | 23,157 | 1,687 | 7.86% |
| 1820 | 21,470 | 1,089 | 5.34% |
| 1810 | 20,381 | 2,491 | 13.92% |
| 1800 | 17,890 | 1,934 | 12.12% |
| 1790 | 15,956 | 0.00% |