K
- Kaiser (1947–1955)
- Kalamazoo (see Michigan)
- Kane-Pennington (see Pennington)
- Kansas City (1906–1908; Kansas City Wonder 1909)
- Kato (1907–1913)
- Kauffman (1909–1912)
- K-D (1912–1913)
- Kearns (1909–1916)
- Keene Steamobile (1900–1901)
- Keeton (1912–1914)
- Keller (1948–1950)
- Keller-Kar (1914)
- Kelsey (1897–1902, 1920–1924)
- Kenmore (1910–1912)
- Kennedy (1915–1917)
- Kennedy Electric (1898–1903)
- Kensington (1899–1904)
- Kent (1916–1917)
- Kent's Pacemaker (1900)
- Kenworthy (1920–1921)
- Kermath (1907–1908)
- Kessler (1920–1921; Kess-Line 8 1922)
- Keystone (1899–1900)
- Keystone (1900)
- Keystone (1914–1915)
- Keystone Six (1909–1910)
- Kiblinger (1907–1909)
- Kidder (1899–1903)
- Kimball Electric (1910–1912)
- King (1896, 1911–1923)
- King Midget (1947–1970)
- King-Remick (1910)
- Kinner (custom cars after World War One)
- Kirk (see also Yale)
- Kissel (1906–1930)
- Kleiber (1924–1929)
- Kline Kar (1910–1923)
- Klink (1907–1910)
- Klock (1900–1901)
- Klondike (1916–1920)
- Knickerbocker (1901–1903)
- Knox (1900–1914)
- Kobusch (1906)
- Koehler (1910–1912)
- Komet (1911)
- Konigslow (see Ottocar)
- Koppin (1914)
- Krastin (1902–1904)
- K-R-I-T (or Krit) (1909–1915)
- Krueger (1905–1906) (see Eclipse)
- Kunz (1902–1905)
- Kurtis (1949–1950, 1954–1955)
- Kurtz-Automatic (1920–1925)
Read more about this topic: List Of Defunct Automobile Manufacturers Of The United States