The Connecticut Senate election, 1920 was held on November 2, 1920, to elect all 35 Senators to the Connecticut State Senate for the term which began in January 1921 and ended in January 1923. It occurred on the same date as other federal and state elections, including the state's gubernatorial election.

The election saw 34 Republicans win election or re-election, and 1 Democrat win election. 10 seats flipped from Democratic to Republican.

Results Results of the 1920 Connecticut Senate election. Party shading denotes winner of Senate seat.

District Constituency Incumbent Senator Republican candidate(percent won) Democratic candidate(percent won) 1 Hartford Wards 8, 9, 10 Edward D. Broder (D) Clarence W. Seymour59.3% Josephine Maxim1 35.6% 2 Hartford Wards 3, 4, 5, 6 Charles C. Hemenway (D) F. Spencer Goodwin54.2% Saul Berman39.7% 3 Hartford Wards 1, 2, 7 Herman P. Koppleman (D) Louis B. Rosenfeld48.0% Thomas F. Dignam40.7% 4 East Hartford, Glastonbury, Manchester, Marlborough, Newington, South Windsor, Rocky Hill, Wethersfield Arthur E. Bowers (R) Arthur E. Bowers65.2% Edward G. Dolan34.8% 5 Avon, Berlin, Bristol, Burlington, Farmington, Plainville, Southington, West Hartford Richard H. Deming (R) John H. Trumbull68.6% Charles H. Curtis31.4% 6 New Britain George W. Klett (R) Edward F. Hall67.9% Abraham M. Gorbach32.1% 7 Bloomfield, Canton, East Granby, East Windsor, Enfield, Granby, Hartland, Simsbury, Suffield, Windsor, Windsor Locks Albert H. House (R) Richard B. Eno64.5% Fred H. Thrall35.5% 8 New Haven Wards 8, 9, 12, and 14 G. Herbert Bishop (D) Charles M. Bakewell59.7% Patrick F. O'Meara35.4% 9 New Haven Wards 1, 2, 10, and 13 Harry A. Leonard (R) James H. MacDonald72.7% Fred D. Faulkner24.3% 10 New Haven Wards 3, 4, and 5 Dennis J. Bailey (D) Hugh McCahey49.2% Daniel L. Bailey42.4% 11 New Haven Wards 6, 7, 11, and 15 Dennis M. Clyne (D) Lorenzo C. Furcolo47.0% Dennis M. Clyne38.2% 12 Branford, East Haven, Guilford, Hamden, Madison, North Branford, North Haven, Wallingford Arthur W. Marsden (R) John W. Sanford69.3% J.P. Craig22.9% 13 Meriden Eugene P. Golden (R) Eugene P. Golden62.5% Harold C. Hall35.1% 14 Bethany, Cheshire, Milford, Naugatuck, Orange2, Prospect, Woodbridge, Wolcott Watson R. Woodruff (R) Charles R. Treat69.0% Arthur H. Doolittle27.1% 15 Waterbury Wards 1, 2, 3, and 6 Charles A. Templeton (R) Lancaster P. Clark58.2% Alfred Lachance38.1% 16 Waterbury Wards 4 and 5 John Hurley (D) Arnold Rasmussen35.3% Daniel F. Pickett62.1% 17 Ansonia, Beacon Falls, Derby, Middlebury, Oxford, Seymour, Southbury Raymond T. French (D) Frederick M. Drew56.0% John W. Schumacher42.0% 18 Groton, New London William C. Fox (D) Cornelius C. Costello62.5% William C. Fox 35.3% 19 Ledyard, Norwich, Preston William B. Wilcox (D) Allyn L. Brown58.7% Charles S. Avery38.9% 20 Bozrah, Colchester, East Lyme, Franklin, Griswold, Lyme, Lebanon, Lisbon, Montville, North Stonington, Old Lyme, Salem, Sprague, Stonington, Voluntown, Waterford Elisha Waterman (R) James Graham68.2% John S. Sullivan31.8% 21 Bridgeport Voting Districts 1, 2, 3, 4, and 5 Frederic A. Bartlett (R) Earle E. Garlick61.9% John F. Mograin30.3% 22 Bridgeport Voting Districts 6, 7, 8, and 11 Alexander L. DeLaney (R) Alexander L. DeLaney61.8% Lawrence T. Gallagher33.6% 23 Bridgeport Voting Districts 9, 10, and 12 George B. Clark (D) Howard S. Challenger62.3% George B. Clark32.8% 24 Bethel, Brookfield, Danbury, New Fairfield, Redding, Ridgefield, Sherman Harvey P. Bissell (R) Edward H. Bailey65.5% George Taylor34.5% 25 Easton, Fairfield, Shelton, Monroe, Newtown, Stratford, Trumbull, Weston, Westport John B. Dillon (R) Elmore S. Banks70.9% John W. Treadwell29.1% 26 Darien, New Canaan, Wilton, Norwalk Charles E. Williamson (R) Nehemiah Candee68.5% Edward J. Quinian31.5% 27 Greenwich, Stamford James R. Mead (R) Matthew H. Kenealy71.8% William P. Mulville28.2% 28 Ashford, Eastford, Killingly, Putnam, Thompson, Woodstock Archibald Macdonald (R) Archibald Macdonald65.1% John O. Fox34.8% 29 Brooklyn, Canterbury, Chaplin, Hampton, Plainfield, Pomfret, Scotland, Sterling, Windham Sessions L. Adams (R) Charles H. Blake58.9% Charles H. Williams41.0% 30 Goshen, Harwinton, Litchfield, New Hartford, Torrington John N. Brooks (R) John N. Brooks68.0%William P. Driscoll32.0% 31 Barkhamsted, Canaan, Colebrook, Cornwall, Kent, Norfolk, North Canaan, Salisbury, Sharon, Winchester Dwight B. Tiffany (R) Malcolm D. Rudd65.5% Edward D. Cartwright34.4% 32 Bethlehem, Bridgewater, Morris, New Milford, Plymouth, Roxbury, Thomaston, Warren, Washington, Watertown, Woodbury Clifford E. Hough (R) Clarence B. Emery65.8% Charles T. Davis34.2% 33 Cromwell, Middlefield, Middletown George F. Chapin (R) Dale D. Butler60.1% Maurice E. Miner39.9% 34 Chester, Clinton, Durham, East Haddam, East Hampton, Essex, Haddam, Killingworth, Old Saybrook, Portland, Saybrook3, Westbrook Edward W. Hazen (R) Mathewson W. Potter70.3% Horace E. Kelsey29.7% 35 Andover, Bolton, Columbia, Coventry, Ellington, Hebron, Mansfield, Somers, Stafford, Tolland, Union, Vernon, Willington William H. Heald (R) William H. Hall69.7% William S. Ellis30.3% Notes 1 Wife of Hiram Percy Maxim. 2 Includes West Haven, in 1920 it was a borough of Orange 3 Today known as Deep River.

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