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List of towns, formation dates, and other details
| Brantingham | |
| Name for Town of Greig 1828–1832 | |
| Croghan | |
| 1830 Settled | |
| 1841 Formed from towns of Diana and Watson | |
| 1848 Daughter town New Bremen formed | |
| Denmark | |
| 1800 Settled | |
| 1807 Formed from Town of Harrisburg(h) | |
| Diana | |
| 1830 Formed from Town of Watson | |
| 1841 Daughter town Croghan formed | |
| Greig | |
| 1792 Settled by French | |
| 1828 Formed as Brantingham from Town of Watson | |
| 1832 Name changed to Greig | |
| 1873 Daughter town Lyonsdale formed | |
| Harrisburg(h) | |
| 1803 Formed in Oneida County from towns of Champion, Lowville, and Mexico | |
| 1805 Transferred to new county of Lewis | |
| 1807 Daughter town Denmark formed | |
| 1808 Daughter town Pinckney formed | |
| High Market 1852–1973 | |
| (see West Turin) | |
| 1852 Formed from Town of West Turin | |
| 1973 Town of High Market dissolved, became a hamlet in the Town of West Turin | |
| Lewis | |
| 1800 Settled | |
| 1852 Formed from towns of Leyden and West Turin | |
| Leyden | |
| 1794 Settled | |
| 1797 Formed in Herkimer County from Town of Steuben | |
| 1798 Transferred to new county of Oneida | |
| 1802 Daughter town Brownville formed | |
| 1805 Transferred to new county of Lewis; daughter town Boonville formed in Oneida County | |
| 1813 Daughter town Wilna formed in Jefferson County | |
| 1821 Daughter town Watson formed | |
| 1852 Daughter town Lewis formed | |
| Lowville | |
| 1797 Settled | |
| 1800 Formed in Oneida County from Town of Mexico | |
| 1803 Daughter town Harrisburg(h) formed | |
| 1805 Transferred to new county of Lewis | |
| Lyonsdale | |
| 1873 Formed from Town of Greig | |
| Martinsburg(h) | |
| 1801 Settled | |
| 1803 Formed in Oneida County from Town of Turin | |
| 1805 Transferred to new county of Lewis | |
| 1823 Annexed land from Town of Turin | |
| Montague | |
| 1846 Settled | |
| 1850 Formed from Town of West Turin | |
| 1867 Annexed land from Town of Osceola | |
| New Bremen | |
| 1798 Settled | |
| 1848 Formed from towns of Croghan and Watson | |
| Osceola | |
| 1838 Settled | |
| 1844 Formed from Town of West Turin | |
| 1867 Ceded land to Town of Montague | |
| Pinckney | |
| 1804 Settled | |
| 1808 Formed from towns of Rodman (Jefferson County) and Harrisburg(h) | |
| Turin | |
| 1798 Settled | |
| 1800 Formed in Oneida County from Town of Mexico | |
| 1803 Daughter town Martinsburg(h) formed | |
| 1805 Transferred to new county of Lewis | |
| 1823 Ceded land to Town of Martinsburg(h) | |
| 1830 Daughter town West Turin formed | |
| Watson | |
| 1815 Settled | |
| 1821 Formed from Town of Leyden | |
| 1828 Daughter town Brantingham (now Greig) formed | |
| 1830 Daughter town Diana formed | |
| 1841 Daughter town Croghan formed | |
| 1848 Daughter town New Bremen formed | |
| West Turin | |
| 1796 Settled at Constableville | |
| 1830 Formed from Town of Turin | |
| 1844 Daughter town Osceola formed | |
| 1850 Daughter town Montague formed | |
| 1852 Daughter towns High Market and Lewis formed | |
| 1973 Annexed dissolved Town of High Market |
Selected links to town websites, clerks, and historians
Castorland (Village)
Constable (Village)
Copenhagen (Village)
Croghan (Town)
Croghan (Village)
Denmark (Town)
Diana (Town)
- No Website
Glenfield (Town)
- No Website
Greig (Town)
Harrisburg (Town)
Harrisville (Village)
Lewis (Town)
Leyden (Town)
Lowville (Town)
Lowville (Village)
Lyons Falls (Village)
Lyonsdale (Town)
- No Website
Martinsburg (Town)
Montague (Town)
New Bremen (Town)
Osceola (Town)
Pinckney (Town)
Port Leyden (Village)
- No Website
Turin (Town)
- No Website
Turin (Village)
- No Website
Watson (Town)
West Turin (Town)
- No Website
*Many townships and villages of Lewis County, NY are too sparsely populated to warrant their own websites. Some have shared sites with other municipalities.