Population size (thousands)
| 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 |
| Saint Andrew | | | | 5,73,566.0 | 5,74,028.0 | 5,73,618.0 | 5,73,181.0 | 5,72,970.0 | 5,72,351.0 | 5,72,146.0 |
| Saint Catherine | 4,76,500.0 | 4,97,600.0 | 5,15,300.0 | 5,16,284.0 | 5,17,439.0 | 5,18,305.0 | 5,18,427.0 | 5,18,828.0 | 5,18,958.0 | 5,19,450.0 |
| Clarendon | 2,35,900.0 | 2,40,700.0 | 2,44,900.0 | 2,45,488.0 | 2,46,134.0 | 2,46,204.0 | 2,46,333.0 | 2,46,766.0 | 2,46,776.0 | 2,46,912.0 |
| Manchester | 1,84,400.0 | 1,87,600.0 | 1,89,700.0 | 1,90,308.0 | 1,90,774.0 | 1,90,918.0 | 1,91,085.0 | 1,91,229.0 | 1,91,235.0 | 1,91,386.0 |
| Saint James | 1,74,000.0 | 1,79,000.0 | 1,83,600.0 | 1,84,619.0 | 1,85,779.0 | 1,86,655.0 | 1,87,396.0 | 1,88,237.0 | 1,89,041.0 | 1,89,885.0 |
| Saint Ann | 1,65,900.0 | 1,69,300.0 | 1,72,200.0 | 1,72,814.0 | 1,73,398.0 | 1,73,846.0 | 1,74,173.0 | 1,74,655.0 | 1,75,158.0 | 1,75,854.0 |
| Saint Elizabeth | 1,46,600.0 | 1,48,100.0 | 1,50,100.0 | 1,50,597.0 | 1,51,113.0 | 1,51,168.0 | 1,51,276.0 | 1,51,304.0 | 1,51,376.0 | 1,51,692.0 |
| Westmoreland | 1,38,500.0 | 1,41,300.0 | 1,44,000.0 | 1,44,874.0 | 1,45,653.0 | 1,46,229.0 | 1,46,913.0 | 1,47,609.0 | 1,48,205.0 | 1,48,827.0 |
| Saint Mary | 1,11,500.0 | 1,12,400.0 | 1,13,600.0 | 1,13,850.0 | 1,14,027.0 | 1,14,135.0 | 1,14,224.0 | 1,14,377.0 | 1,14,507.0 | 1,14,676.0 |
| Saint Thomas | 91,300.0 | 92,600.0 | 93,900.0 | 94,071.0 | 94,238.0 | 94,215.0 | 94,176.0 | 94,210.0 | 94,141.0 | 94,284.0 |
| Kingston | | | | 89,275.0 | 89,535.0 | 89,637.0 | 89,641.0 | 89,823.0 | 89,901.0 | 90,113.0 |
| Portland | 80,100.0 | 80,900.0 | 81,700.0 | 81,669.0 | 81,646.0 | 81,487.0 | 81,339.0 | 81,283.0 | 81,163.0 | 81,098.0 |
| Trelawny | 73,100.0 | 74,000.0 | 75,100.0 | 75,559.0 | 75,905.0 | 76,308.0 | 76,572.0 | 77,027.0 | 77,409.0 | 77,746.0 |
| Hanover | 67,100.0 | 68,200.0 | 69,500.0 | 69,929.0 | 70,336.0 | 70,657.0 | 70,922.0 | 71,154.0 | 71,443.0 | 71,815.0 |