Connecticut - County and Town Formations
Connecticut Counties County Name Date Formed Parent County County Seat Fairfield 1666 Original County Bridgeport Hartford 1666 Original County Hartford Litchfield 1751 Fairfield and Hartford Litchfield Middlesex 1785 Hartford, New Haven and New London Middletown New Haven 1666 Original County New Haven New London 1666 Original County New London Tolland 1785 Windham Vernon Windham 1726 Hartford and New London Putnam
| Andover | 1848 | from Coventry and Hebron | Tolland |
| Ansonia | 1889 | from Derby | New Haven |
| Ashford | 1714 | Windham | |
| Avon | 1830 | from Farmington | Hartford |
| Barkhamsted | 1779 | Litchfield | |
| Beacon Falls | 1871 | from Bethany, Oxford, Seymour, Naugatuck | New Haven |
| Berlin | 1785 | from Farmington, Middletown and Wethersfield | Hartford |
| Bethany | 1832 | from Woodbridge | New Haven |
| Bethel | 1855 | from Danbury | Fairfield |
| Bethlehem | 1787 | from Woodbury | Litchfield |
| Bloomfield | 1835 | from Windsor, Farmington and Simsbury | Hartford |
| Bolton | 1720 | Tolland | |
| Bozrah | 1786 | from Norwich | New London |
| Branford | 1685 | from New Haven | New Haven |
| Bridgeport | 1821 | from Stratford and Fairfield | Fairfield |
| Bridgewater | 1856 | from New Milford | Litchfield |
| Bristol | 1785 | from Farmington | Hartford |
| Brookfield | 1788 | from Danbury, New Milford and Newton | Fairfield |
| Brooklyn | 1786 | from Pomfret and Canterbury | Windham |
| Burlington | 1806 | from Bristol | Hartford |
| Canaan | 1739 | Litchfield | |
| Canterbury | 1703 | from Plainfield | Windham |
| Canton | 1806 | from Simsbury | Hartford |
| Chaplin | 1822 | from Windham, Hampton and Mansfield | Windham |
| Chatham | 1767 | Now East Hampton | Middlesex |
| Cheshire | 1780 | from Wallingford | New Haven |
| Chester | 1836 | from Saybrook | Middlesex |
| Clinton | 1838 | from Killingworth | Middlesex |
| Colchester | 1698 | New London | |
| Colebrook | 1779 | Litchfield | |
| Columbia | 1804 | from Lebanon | Tolland |
| Cornwall | 1740 | Litchfield | |
| Coventry | 1712 | Tolland | |
| Cromwell | 1851 | from Middletown | Middlesex |
| Danbury | 1687 | Fairfield | |
| Darien | 1820 | from Stamford | Fairfield |
| Deep River | 1635 | as Saybrook; renamed, 1947 | Middlesex |
| Derby | 1675 | New Haven | |
| Durham | 1708 | Middlesex | |
| East Granby | 1858 | from Granby and Windsor Locks | Hartford |
| East Haddam | 1734 | from Haddam | Middlesex |
| East Hampton | 1767 | as Chatham; renamed, 1915, from Middletown | Middlesex |
| East Hartford | 1783 | from Hartford | Hartford |
| East Haven | 1785 | from New Haven | New Haven |
| East Lyme | 1839 | from Lyme and Waterford | New London |
| East Windsor | 1768 | from Windsor | Hartford |
| Eastford | 1847 | from Ashford | Windham |
| Easton | 1845 | from Weston | Fairfield |
| Ellington | 1786 | from East Windsor | Tolland |
| Enfield | 1683 | part of Massachusetts until 1749 | Hartford |
| Essex | 1852 | from Saybrook (name of town of Old Saybrook from 1852-54, when a new town of Old Saybrook separate from this one. The town changed its named to Essex in 1852) | Middlesex |
| Fairfield | 1639 | Fairfield | |
| Farmington | 1654 | Hartford | |
| Franklin | 1786 | from Norwich | New London |
| Glastonbury | 1690 | from Wethersfield | Hartford |
| Goshen | 1739 | Litchfield | |
| Granby | 1786 | from Simsbury | Hartford |
| Greenwich | 1665 | from Stamford (part of New Amsterdam from 1642-1656) | Fairfield |
| Griswold | 1815 | from Preston | New London |
| Groton | 1705 | from New London | New London |
| Guilford | 1643 | New Haven | |
| Haddam | 1668 | Middlesex | |
| Hamden | 1786 | from New Haven | New Haven |
| Hampton | 1786 | from Windham, Pomfret, Brooklyn, Canterbury and Mansfield | Windham |
| Hartford | 1635 | Hartford | |
| Hartland | 1761 | Hartford | |
| Harwinton | 1737 | Litchfield | |
| Hebron | 1708 | Tolland | |
| Huntington | 1789 | renamed Shelton, 1919 | Fairfield |
| Kent | 1739 | Litchfield | |
| Killingly | 1708 | Windham | |
| Killingworth | 1667 | Middlesex | |
| Lebanon | 1700 | New London | |
| Ledyard | 1836 | from Groton | New London |
| Lisbon | 1786 | from Norwich | New London |
| Litchfield | 1719 | Litchfield | |
| Lyme | 1667 | from Saybrook | New London |
| Madison | 1826 | from Guilford | New Haven |
| Manchester | 1823 | from East Hartford | Hartford |
| Mansfield | 1702 | from Windham | Tolland |
| Marlborough | 1803 | from Colchester, Glastonbury and Hebron | Hartford |
| Meriden | 1806 | from Wallingford | New Haven |
| Middlebury | 1807 | from Waterbury, Woodbury and Southbury | New Haven |
| Middlefield | 1866 | from Middletown | Middlesex |
| Middletown | 1651 | Middlesex | |
| Milford | 1639 | New Haven | |
| Monroe | 1823 | from Huntington | Fairfield |
| Montville | 1786 | from New London | New London |
| Morris | 1859 | from Litchfield | Litchfield |
| Naugatuck | 1844 | from Waterbury, Bethany and Oxford | New Haven |
| New Britain | 1850 | from Berlin | Hartford |
| New Canaan | 1801 | from Norwalk and Stamford | Fairfield |
| New Fairfield | 1740 | Fairfield | |
| New Hartford | 1738 | Litchfield | |
| New Haven | 1638 | New Haven | |
| New London | 1648 | New London | |
| New Milford | 1712 | Litchtfield | |
| New Roxbury | 1690 | Now Woodstock | Windham |
| Newington | 1871 | from Wethersfield | Hartford |
| Newtown | 1711 | Fairfield | |
| Norfolk | 1758 | Litchfield | |
| North Branford | 1831 | from Branford | New Haven |
| North Canaan | 1858 | from Canaan | Litchfield |
| North Haven | 1786 | from New Haven | New Haven |
| North Stonington | 1807 | from Stonington | New London |
| Norwalk | 1651 | Fairfield | |
| Norwich | 1662 | New London | |
| Old Lyme | 1855 | as South Lyme; renamed, 1857 | New London |
| Old Saybrook | 1854 | see Essex for explanation of town's formation | Middlesex |
| Orange | 1822 | from Milford and New Haven | New Haven |
| Oxford | 1798 | from Derby and Southbury | New Haven |
| Plainfield | 1699 | Windham | |
| Plainville | 1869 | from Framington | Hartford |
| Plymouth | 1795 | from Watertown | Litchfield |
| Pomfret | 1713 | Windham | |
| Portland | 1841 | from Chatham | Middlesex |
| Preston | 1687 | New London | |
| Prospect | 1827 | from Cheshire and Waterbury | New Haven |
| Putnam | 1855 | from Thompson, Pomfret and Killingly | Windham |
| Redding | 1767 | from Fairfield | Fairfield |
| Ridgefield | 1709 | Fairfield | |
| Rocky Hill | 1843 | from Wethersfield | Hartford |
| Roxbury | 1796 | from Woodbury | Litchfield |
| Salem | 1819 | from Colchester, Lyme and Montville | New London |
| Salisbury | 1741 | Litchfield | |
| Saybrook | 1635 | Now Deep River | Middlesex |
| Scotland | 1857 | from Windham | Windham |
| Seymour | 1850 | from Derby | New Haven |
| Sharon | 1739 | Litchfield | |
| Shelton | 1789 | as Huntington; renamed, 1919 | Fairfield |
| Sherman | 1802 | from New Fairfield | Fairfield |
| Simsbury | 1670 | Hartford | |
| Somers | 1734 | from Enfield - part of Massachusetts until 1749 | Tolland |
| South Lyme | 1855 | Now Old Lyme | New London |
| South Windsor | 1845 | from East Windsor | Hartford |
| Southbury | 1787 | from Woodbury | New Haven |
| Southington | 1779 | from Farmington | Hartford |
| Sprague | 1861 | from Lisbon and Franklin | New London |
| Stafford | 1719 | Tolland | |
| Stamford | 1641 | Fairfield | |
| Sterling | 1794 | from Voluntown | Windham |
| Stonington | 1662 | New London | |
| Stratford | 1639 | Fairfield | |
| Suffield | 1674 | part of Massachusetts until 1749 | Hartford |
| Thomaston | 1875 | from Plymouth | Litchfield |
| Thompson | 1785 | from Killingly | Windham |
| Tolland | 1715 | Tolland | |
| Torrington | 1740 | Litchfield | |
| Trumbull | 1797 | from Stratford | Fairfield |
| Union | 1734 | Tolland | |
| Vernon | 1808 | from Bolton | Tolland |
| Voluntown | 1721 | New London | |
| Wallingford | 1670 | from New Haven | New Haven |
| Warren | 1786 | from Kent | Litchfield |
| Washington | 1779 | from Woodbury, Litchfield, Kent and New Milford | Litchfield |
| Waterbury | 1686 | New Haven | |
| Waterford | 1801 | from New London | New London |
| Watertown | 1780 | from Waterbury | Litchfield |
| West Hartford | 1854 | from Hartford | Hartford |
| West Haven | 1921 | from Orange | New Haven |
| Westbrook | 1840 | from Saybrook | Middlesex |
| Weston | 1787 | from Fairfield | Fairfield |
| Westport | 1835 | from Fairfield, Norwalk and Weston | Fairfield |
| Wethersfield | 1634 | Hartford | |
| Willington | 1727 | Tolland | |
| Wilton | 1802 | from Norwalk | Fairfield |
| Winchester | 1771 | Litchfield | |
| Windham | 1692 | Windham | |
| Windsor | 1633 | Hartford | |
| Windsor Locks | 1854 | from Windsor | Hartford |
| Wolcott | 1796 | from Waterbury and Southington | New Haven |
| Woodbridge | 1784 | from New Haven and Milford | New Haven |
| Woodbury | 1673 | Litchfield | |
| Woodstock | 1690 | called New Roxbury as part of Massachusetts until 1749 | Windham |
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