- Abington
- Social Library Association of Abington
- Barkhamsted
- Barkhamsted Library (est.1797)
- Berlin
- Kensington Parish Library, Berlin (est. ca.1788)
- Bristol
- First Society in Bristol (est.1792)
- Brooklyn
- Union Library, Brooklyn (est.1774)
- Chatham
- Republican Library Company, Chatham (est.1795)
- Chelsea
- T. Hubbard's circulating library, Chelsea
- Cheshire
- Cheshire Library Society (est.1792)
- Library in Salem Society, Cheshire (est.1783)
- Library in the Society of Columbia, Cheshire (est.1793)
- Cornwall
- United Proprietors Library, Cornwall (ca.1799-1804)
- Danbury
- Franklin Library, Danbury (1770–1833)
- Library in Bethel Society, Danbury (est.1793)
- Durham
- Book Company of Durham (1733–1856)
- Ethosian Society, Durham (1787–1793)
- New Library Company, Durham (est.1788)
- East Haddam
- Hadlyme Society, East Haddam (est.179)
- East Hartford
- First Library Company, East Hartford (est.1794)
- Union Library, East Hartford (est.1791)
- East Haven
- Union Library, East Haven (est.1796)
- East Windsor
- Federal Library, East Windsor (est. ca.17890
- Social Library in East Windsor (est.1791)
- Farmington
- Library in First Society, Farmington (est.1795)
- Northington Public Library, Farmington (1789-ca.1799)
- Franklin
- Franklin Library, Franklin (est.1790)
- Griswold
- North Preston Parish Library, Griswold (est.1761)
- Union Circle of Friends, Griswold (1795–1821)
- Guilford
- Library of Killingworth, Lyme, Saybrook and Guilford (est.1737; located in Guilford)
- Library of Saybrook, Lime, and Guilford
- Library in First Society, Guilford (est.1790)
- Hadlyme
- Hadlyme Library (est.1789)
- Hartford
- Harwinton
- Episcopalian Society Library, Harwinton (est.1793)
- Juvenile Library, Harwinton (est.1797)
- Union Harwinton Library (1798–1857)
- Lebanon
- Philogrammatican Society, Lebanon
- Litchfield
- St. Paul's Lodge Library, Litchfield (est.1781)
- Madison
- Farmer's Library, Madison (est.1793)
- Mansfield
- Proprietors Library North Society, Mansfield (est.1795)
- Proprietors Library South Society, Mansfield (est.1795)
- Middletown
- Library Company in Middletown (est.1765)
- Middletown Library
- Milford
- Associate Library, Milford (1761–1820)
- Milford Library (est.1745)
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- Naugatuck
- Library in Salem Society, Naugatuck (est.1783)
- New Haven
- Mechanic Library Society of New-Haven (est.1793)
- New Haven Library Company
- Yale College Library
- New London
- S. Green's Circulating Library, New London
- New Milford
- Union Library, New-Milford (est.1796)
- Newington
- Book Company in Newington (est.1752)
- Charity Library, Newington (est.1787)
- North Haven
- Northill Library, North Haven (est.1792)
- Northington
- Northington Public Library
- Norwich
- Franklin Library Company, Norwich
- Library in First Society, Norwich (est. 1796)
- Norwich Library Company (est.1793)
- John Trumbull's circulating library, Norwich (est.1796)
- Samuel Trumbull's circulating library, Norwich
- Pomfret
- Social Library of Abington in Pomfret (est.1793)
- United English Library for the Propagation of Christian and Useful Knowledge, Pomfret (1739–1805)
- Saybrook
- Library of Second Society, Saybrook (est.1795)
- Southington
- Union Library Society, Southington (1797–1847)
- Stonington
- Stonington Point Library (est.1793)
- Suffield
- Suffield Library (est.1791)
- Tolland
- Tolland Proprietary Library (est.1787)
- Torrington
- Public Library of Torrington and Winchester (est.1787; located in Torrington)
- Warren
- Free Mason Lodge Library, Warren (est.1799)
- Public Library in Warren (est.1770)
- Warren library
- Waterbury
- Library in First Society, Waterbury (est.1771)
- Union Library, Waterbury (est. ca.1797)
- Watertown
- Union Library Society, Watertown (est.1799)
- West Simsbury
- Friendship Library, West Symsbury (est.1793)
- Weston
- North Fairfield Library, Weston (est. ca.1790)
- Wethersfield
- Social Library in Stepney Parish, Wethersfield (est.1794)
- Union Library Society of Wethersfield (1783–1850)
- Winchester
- Society of Winsted, Winchester (est.1799)
- Windham
- Library Company in Scotland, Widham (1791–1830)
- Library in First Society, Windham (ca.1795-1798)
- Wolcott
- Library in Farmingbury, Wolcott (est.1779)
- Woodbridge
- Library in Woodbridge (est.1787)
- Woodbury
- Union Library, Woodbury (est.1772)
- Woodstock
- Library of First Society, Woodstock (est.1797)
- United Lyon Library of Woodstock, also called: United Lynn Library (est.1768)
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