The date of separation from its donor town appears below each town name.
Towns in enclosed boxes are the towns of present-day Monroe County.
Solid lines indicate separation
Dotted lines indicate renaming
The diagram covers the years 1789 to 1861. The diagram does not cover the multiple annexations of portions of Brighton, Chili, Gates, Greece, and Irondequoit by the City of Rochester during this period and continuing into the 20th Century.
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