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List of towns, formation dates, and other details
| Amherst | |
| In Niagara County 1818-1821 | |
| Aurora | |
| In Niagara County 1808-1821 | |
| Boston | |
| In Niagara County 1808-1821 | |
| Buffalo | |
| In Niagara County 1810-1821 | |
| Cambria | |
| Settled c. 1800 | |
| 1808 Formed from Town of Willink (now Aurora, Erie County) | |
| 1812 Daughter towns Hartland, Niagara, ands Porter formed | |
| 1818 Daughter town Lewiston formed | |
| 1824 Daughter town Lockport formed | |
| Clarence | |
| In Niagara County 1808-1821 | |
| Concord | |
| In Niagara County 1812-1821 | |
| Eden | |
| In Niagara County 1812-1821 | |
| Hamburg(h) | |
| In Niagara County 1812-1821 | |
| Hartland | |
| 1803 Settled | |
| 1812 Formed from Town of Cambria | |
| 1817 Daughter town of Royalton formed | |
| 1823 Daughter town Somerset | |
| 1824 Daughter town Newfane formed | |
| Holland | |
| In Niagara County 1818–1821 | |
| Lewiston | |
| Occupied by French intermittently until the British takeover in 1763 | |
| First permanent settlement c. 1800 | |
| 1818 Formed from Town of Cambria | |
| Lockport (city) | |
| 1865 Incorporated as a city from the Village of Lockport in Town of Lockport | |
| Lockport (town) | |
| 1805 Settled near Lockport village | |
| 1824 Formed from towns of Cambria and Royalton | |
| 1865 Village of Lockport became City of Lockport | |
| Newfane | |
| 1807 Settlers from Canada | |
| 1824 Formed from towns of Hartland, Somerset, and Wilson | |
| Newstead | |
| In Niagara County 1808-1821 | |
| Niagara | |
| 1678 Temporarily settled at La Salle | |
| 1759 Permanently settled at Schlosser | |
| 1812 Formed as Schlosser from Town of Cambria | |
| 1816 Name changed to Niagara | |
| 1827 Daughter town Pendleton formed | |
| 1836 Daughter town Wheatfield formed | |
| 1892 Daughter city Niagara Falls formed | |
| Niagara Falls (city) | |
| 1892 Incorporated as a city from Village of Niagara Falls and Village of Niagara City in Town of Niagara | |
| North Tonawanda (city) | |
| 1897 Incorporated as a city from the Village of North Towanda in the Town of Wheatfield | |
| Pendleton | |
| 1805 Settled | |
| 1827 Formed from Town of Niagara | |
| Porter | |
| French military and trading presence from late 1600s; permanently settled by early 1800s | |
| 1812 Formed from Town of Cambria | |
| 1818 Daughter town Wilson formed | |
| Royalton | |
| 1803 Settled | |
| 1817 Formed from Town of Hartland | |
| 1824 Daughter town Lockport formed | |
| Schlosser | |
| Name from Town of Niagara 1812-1812 | |
| Somerset | |
| 1810 Settled | |
| 1823 Formed from Town of Hartland | |
| 1824 Daughter town Newfane formed | |
| Wales | |
| In Niagara County 1818-1821 | |
| Wheatfield | |
| 1802 Settled | |
| 1836 Formed from Town of Niagara | |
| Wilson | |
| 1810 Settled | |
| 1818 Formed from Town of Porter | |