Since 1868 there have been 12 Marshals and 24 Police Chiefs for the City of Waterloo. Listed below are the names and dates of tenure for the Marshal's and Police Chiefs.
| Tenure |
Name |
Title |
| 2022-2024 | Joe Leibold | Chief of Police |
| 2020-2022 | Dr. Joel F. Fitzgerald | Chief of Police |
| 2010-2019 | Daniel J. Trelka | Police Chief |
| 2000-2010 | Thomas J. Jennings | Police Chief |
| 1990-2000 | Bernal Koehrsen, Jr. | Police Chief |
| 1985-1990 | Roger Shook | Police Chief |
| 1982-1984 | Kenneth Huck | Police Chief |
| 1980-1982 | Junior Grimm | Police Chief |
| 1978-1980 | Frank J. Bemisdarfer | Police Chief |
| 1970-1978 | Robert L. Beener | Chief of Police |
| 1961-1970 | Robert S. Wright | Chief of Police |
| 1946-1961 | Harry J. Krieg | Chief of Police |
| 1944-1946 | Ralph J. Davis | Chief of Police |
| 1934-1943 | Hugh R. Crumrine | Police Chief |
| 1930-1933 | F. M. Shores | Police Chief |
| 1926-1929 | Chas. Mohlis | Police Chief |
| 1924-1925 | E. A. Leighton | Police Chief |
| 1921-1923 | P. E. Walker | Police Chief |
| 1920-1921 | H. H. Young | Police Chief |
| 1919-1920 | Geo. Weilein | Police Chief |
| 1917-1919 | F A. Sporle | Police Chief |
| 1916-1917 | J. D. Caldwell | Police Chief |
| 1912-1915 | E. A. Leighton | Police Chief |
| 1910-1911 | W T. Dinneen | Police Chief |
| 1908-1909 | E. A. Leighton | Police Chief |
| 1905-1907 | J. N. Sweitzer | Marshal |
| 1901-1904 | O. H. Simmerling | Marshal |
| 1893-1900 | J. F. Klingaman | Marshal |
| 1888-1892 | S. M. Hoff | Marshal |
| 1886-1887 | M. W. Gipe | Marshal |
| 1883-1885 | W. C. Munger | Marshal |
| 1882-1882 | D. E. Hume | Marshal |
| 1881-1881 | Charles Mantle | Marshal |
| 1878-1880 | H. W. Jenney | Marshal |
| 1876-1877 | H. H. Saunders | Marshal |
| 1874-1875 | J. P. Evans (App'd) | Marshal |
| 1873-1873 | James Ellis (App'd) | Marshal |
| 1869-1872 | J. P. Evans | Marshal |
| 1868-1868 | S. M. Hoff | Marshal |