Taken from La Storia di Misilmeri, by Mons. Francesco Romano and from the Comune di Misilmeri web site:

Year: 999: 7,704 Inhabitants plus 617 in the hamlet of Gibilrossa; total 8321

Year 1501: 150 inhabitants with 40 families

Year 1593: 1st Census: 562 inhabitants with 146 families

Year 1623: 2nd Census: 1177 inhabitants with 291 families

Year 1636: 3rd Census: 889 inhabitants with 246 families

Year 1651: 4th Census: 1074 inhabitants with 306 families

Year 1682: 5th Census: 815 inhabitants with 201 families

Year 1748: 6th Census: 2725 inhabitants with 717 families

Year 1760: 7th Census: 2698 inhabitants with 722 families

Year 1811-1816: 8th Census: 5655 inhabitants

Year 1844: 9th Census: 8679 inhabitants

Year 1861: 1st Census after the unification of Italy: 7460 inhabitants

Year 1871 2nd Census: 7467 inhabitants

Year 1881: 3rd Census: 10,748 inhabitants

Year 1901: 4th Census: 13, 247 inhabitants

Year 1911: 5th Census: 12,043 inhabitants

Year 1921: 6th Census: 12,168 inhabitants

Year 1931: 7th Census: 11,582 inhabitants

Year 1936: 8th Census: 12, 176 inhabitants

Year 1951: 9th Census: 13,143 inhabitants

Year 1961: 10th Census: 14,069 inhabitants with 3,742 families

Year 1971: 11th Census: 14,900 inhabitants with 4158 families

Year 1981: 12th Census: 16,727 inhabitants with 5,158 families

Year 1991: 13th Census: 20,072 inhabitants with 6,400 families