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List of towns, formation dates, and other details
| Brighton | |
| 1790 Settled | |
| 1814 Formed in Ontario County from Town of Smallwood | |
| 1821 Transferred to new county of Monroe | |
| 1834 Ceded land to city of Rochester | |
| 1839 Daughter town Irondequoit formed | |
| Chili | |
| 1792 Settled | |
| 1822 Formed from Town of Riga | |
| Clarkson | |
| 1803 Settled | |
| 1819 Formed in Genesee County from Town of Murray | |
| 1821 Transferred to new county of Monroe | |
| 1852 Daughter town Union (now Hamlin) formed | |
| East Rochester | |
| 1897 Village of Despatch established, shared between towns of Pittsford and Perinton | |
| 1906 Incorporated as Village of East Rochester | |
| 1981 Coterminous Village and Town of East Rochester formed from towns of Pittsford and Perinton | |
| Gates | |
| 1802 Formed in Genesee County as Town of Northampton | |
| 1808 Daughter towns Murray, Parma, and Riga formed | |
| 1809 Settlers from Vermont | |
| 1812 Name changed from Northampton to Gates | |
| 1821 Transferred to new county of Monroe | |
| 1822 Daughter town Greece formed | |
| 1834 Village of Rochester incorporated as City of Rochester | |
| Greece | |
| 1792 Settled | |
| 1822 Formed from Town of Gates | |
| Hamlin | |
| 1810 Settled | |
| 1852 Formed as Town of Union from Town of Clarkson | |
| 1861 Name changed to Hamlin | |
| Henrietta | |
| 1806 Settled | |
| 1818 Formed in Ontario County from Town of Pittsford | |
| 1821 Transferred to new county of Monroe | |
| Irondequoit | |
| 1791 Settled | |
| 1839 Formed from Town of Brighton | |
| Mendon | |
| 1790 Settlers from Vermont at Honeoye Falls | |
| 1812 Formed in Ontario County from Town of Bloomfield (now East Bloomfield) | |
| 1821 Transferred to new county of Monroe | |
| Murray | |
| In Monroe County 1821–1824 | |
| Northampton | |
| Name for Town of Gates 1802–1812 | |
| Ogden | |
| 1802 Settlers from East Haddam, CT | |
| 1817 Formed in Genesee County from Town of Parma | |
| 1821 Transferred to new county of Monroe | |
| Parma | |
| 1796 Settlers from Connecticut | |
| 1808 Formed in Genesee County from Town of Northampton (now Gates) | |
| 1817 Daughter town Ogden formed | |
| 1821 Transferred to new county of Monroe | |
| Penfield | |
| 1791 Settlers from Vermont are not permanent; 1795 land repurchased and permanent settlement begins | |
| 1810 Formed in Ontario County from Town of Boyle | |
| 1821 Transferred to new county of Monroe | |
| 1840 Daughter town of Webster formed | |
| Perinton | |
| 1790 Settled, then abandoned | |
| 1791 First permanent settlers | |
| 1812 Formed in Ontario County from Town of Boyle | |
| 1821 Transferred to new county of Monroe | |
| 1981 Daughter town East Rochester formed | |
| Pittsford | |
| 1789 Settled | |
| 1814 Formed in Ontario County from Town of Smallwood | |
| 1818 Daughter town Henrietta formed | |
| 1821 Transferred to new county of Monroe | |
| 1981 Daughter town East Rochester formed | |
| Riga | |
| 1805–06 Settled | |
| 1808 Formed in Genesee County from Town of Northampton (now Gates) | |
| 1821 Transferred to new county of Monroe | |
| 1822 Daughter town Chili formed | |
| Rochester (city) | |
| 1788–89 Settled | |
| 1834 Formed as a city from Village of Rochester (Town of Gates), and land from Town of Brighton | |
| Rush | |
| 1799 Settlers from New Hampshire | |
| 1818 Formed in Ontario County from Town of Avon | |
| 1821 Transferred to new county of Monroe | |
| Sweden | |
| 1807 Settled | |
| 1814 Formed in Genesee County from Town of Murray | |
| 1821 Transferred to new county of Monroe; daughter Town of Clarendon formed in Genesee County | |
| Union | |
| Name for Town of Hamlin 1852–1861 | |
| Webster | |
| 1805 Settled | |
| 1840 Formed from Town of Penfield | |
| Wheatland | |
| 1786 Settlers from Pennsylvania | |
| 1821 Formed as Town of Inverness from Town of Caledonia, Livingston County; name changed to Wheatland later that year |
Selected links to town websites, clerks, and historians