Middlesex County Population 2018
Middlesex County's estimated population is 10,679 with a growth rate of -0.83% in the past year according to the most recent United States census data. Middlesex County is the 115th largest county in Virginia.
| Year | Population | Growth | Growth Rate |
| 2017 | 10,679 | -89 | -0.83% |
| 2016 | 10,768 | 90 | 0.84% |
| 2015 | 10,678 | 28 | 0.26% |
| 2014 | 10,650 | -126 | -1.17% |
| 2013 | 10,776 | -69 | -0.64% |
| 2012 | 10,845 | -6 | -0.06% |
| 2011 | 10,851 | -128 | -1.17% |
| 2010 | 10,979 | 2,326 | 26.88% |
| 1990 | 8,653 | 934 | 12.10% |
| 1980 | 7,719 | 1,424 | 22.62% |
| 1970 | 6,295 | -24 | -0.38% |
| 1960 | 6,319 | -396 | -5.90% |
| 1950 | 6,715 | 42 | 0.63% |
| 1940 | 6,673 | -600 | -8.25% |
| 1930 | 7,273 | -884 | -10.84% |
| 1920 | 8,157 | -695 | -7.85% |
| 1910 | 8,852 | 632 | 7.69% |
| 1900 | 8,220 | 762 | 10.22% |
| 1890 | 7,458 | 1,206 | 19.29% |
| 1880 | 6,252 | 1,271 | 25.52% |
| 1870 | 4,981 | 617 | 14.14% |
| 1860 | 4,364 | -30 | -0.68% |
| 1850 | 4,394 | 2 | 0.05% |
| 1840 | 4,392 | 270 | 6.55% |
| 1830 | 4,122 | 65 | 1.60% |
| 1820 | 4,057 | -357 | -8.09% |
| 1810 | 4,414 | 211 | 5.02% |
| 1800 | 4,203 | 63 | 1.52% |
| 1790 | 4,140 | 0.00% |