List of United States clock companies

The following is a list of American companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name.

Lawson Clock Company, Los Angeles, California
 * Samuel Abbott; Montpelier, Vermont (1830–1861)
 * Ansonia Clock Company; Ansonia, Connecticut and Brooklyn, New York (1851–1929)
 * Attleboro Clock Company; Attleboro, Massachusetts (1890–1915)
 * Bailey Banks & Biddle; Philadelphia, Pennsylvania (1832–1846)
 * Birge, Gilbert & Co; Bristol, Connecticut (1835)
 * Birge, Mallory & Co; Bristol, Connecticut (1837–1843)
 * Birge, Peck & Co; Bristol, Connecticut (1830)
 * Boardman & Dunbar; Bristol, Connecticut (1811)
 * Boardman & Wells; Bristol, Connecticut (1832–1843)
 * Brewster & Ingrahams; Bristol, Connecticut (1843–1852)
 * Bridgeport Clock Company (? - 1853)
 * Chauncey Boardman; Bristol, Connecticut (1813–1823)
 * Chauncey Jerome; Bristol, Connecticut (1816–1853)
 * Chelsea Clock Company; Boston, Massachusetts (1887–Present)
 * Chicago Clock Manufacturing Company; Chicago, Illinois (ca. 1860–?)
 * Colonial of Zeeland Clock Company; Zeeland, Michigan (1899–1986)
 * David Wood; Newburyport, Massachusetts (1766–1824)
 * Dyer, Wadsworth & Company; Augusta, Georgia (1838–1843)
 * E. Howard & Co.; Boston, Massachusetts (1842–Present)
 * E & A Ingrahams; Bristol, Connecticut (1852–1856)
 * Elgin Watch Company; Illinois (1864-1968)
 * Elias Ingraham; Bristol, Connecticut (1831–1841)
 * Elias Ingraham & Company; Bristol, Connecticut (1857–1860)
 * E Ingraham Company; Bristol, Connecticut (1884–1958)
 * Eli Terry; Northbury, Connecticut (1795–1852)
 * E N Welch Company; Bristol, Connecticut (1864–1903)
 * F Kroeber; New York, New York (1870–1887)
 * F Kroeber Clock Company; New York, New York (1887–1904)
 * Franklin Clock Company; Philadelphia, Pa (1931-1962)
 * General Electric
 * General Time; Stamford, Connecticut (1930–2001)
 * H.C. Thompson Clock Company; Bristol, Connecticut (1903-?)
 * Harris & Mallow, Lakewood, NJ
 * Heman Clark; Plymouth Hollow, Connecticut (1783–1813)
 * Heman Clark; Salem Bridge, Connecticut (1738–1838)
 * Herschede Clock Company; Cincinnati, Ohio and Starkville, Mississippi (1885-1984)
 * Hotchkiss and Benedict; Auburn, New York (ca. 1835)
 * Howard Miller Clock Company; Zeeland, Michigan (1926–Present)
 * Ingraham Company; Bristol, Connecticut (1958–1967)
 * Ithaca Calendar Clock Company; Ithaca, New York (late 1800s)
 * Jennings Brothers Manufacturing Corporation Bridgeport, Connecticut  (? - ?)
 * Joyce Bros. & Co.; Boston, Massachusetts, Providence, Rhode Island, and Portland, Maine (? - ?)
 * Luman Watson; Cincinnati, Ohio (1809–1834)
 * Masterclock Inc.; St. Charles, MO (1994-Present)
 * Munger and Benedict; Auburn, New York (ca. 1825)
 * National Time and Signal; Wixom, Michigan (1877–Present)(Introduces the world's first pneumatically controlled master clock system.)
 * New England Clock Company; New Haven, Connecticut (1959–2000)
 * New Haven Clock Company; New Haven, Connecticut (1853–1959)
 * Parker & Whipple; Meriden, Connecticut (1795–1868)
 * Parker & Whipple Manufacturing Company; Meriden, Connecticut (1868–1893)
 * Parker Clock Company; Meriden, Connecticut (1893–1934)
 * Pomeroy, Noah; Bristol, Connecticut (1847-1878)
 * Ray and Ingraham; Bristol, Connecticut  (1841–1844)
 * Reeves & Company; (1820 - ?)
 * Ridgeway Clocks; Ridgeway, Virginia
 * Riley Whiting; Winchester, Connecticut and Winstead, Connecticut (1808–1835)
 * Samuel Whiting; Concord, Massachusetts (1808–1817)
 * Salem Clock Company; Hartford, Connecticut
 * Sangamo Electric Company; Springfield, Illinois (1899–1931)
 * Self Winding Clock Company; New York City, New York (1886-1970)
 * Sempire Clock Company; St.Louis, Missouri (1897-1908)
 * Seth Thomas Clock Company (1807–Present)
 * Sessions Clock Company; Bristol, Connecticut (1903–1969)
 * Spartus Corporation; Chicago, Illinois, and Louisville, Mississippi (1934–2001)
 * Standard Electric Time Company; Waterbury, Connecticut, Springfield, Massachusetts, and Tecumseh, Michigan (1887–Present)
 * Time Telegraph Company (1883–1887)
 * United Clock Company; Peru, Illinois (1853–1887)
 * Waltham Aircraft Clock Corporation; since 1994 in Ozark, Alabama, continuation of Waltham Precision Instruments Company
 * Warren Clock Company, Ashland, Massachusetts; 1912-1946
 * Waterbury Clock Company; Waterbury, Connecticut (1857–1967)
 * Western Clock Company or Westclox; (1885–2001)
 * William L Gilbert; Winsted, Connecticut (1841–1871)
 * William L Gilbert Clock Company; Winsted, Connecticut (1871–1934)
 * William L. Gilbert Clock Corporation; Winstead, Connecticut (1934–1964)
 * Williams, Orton & Preston; Farmington, Connecticut (1830–1840)
 * Wood Art for Living; Severn, Maryland (2009-Present)
 * Weursch; Fall River, Massachusetts (1961-1995)
 * Elderhorst Bells, Inc., Palm, Pa. (1964-Present)