Ogle County, IL Pop 53,000 Formed in 1837
| Year Winner Margin | Swing |
| 2016: Trump +26.1% | R+9.4 |
| 2012: Romney +16.7% | R+9.1 |
| 2008: McCain +7.6% | D+16.9 |
| 2004: Bush +24.5% | R+1.9 |
| 2000: Bush +22.6% | R+7.4 |
| 1996: Dole +15.2% | R+2.8 |
| 1992: Bush +12.4% | D+22.1 |
| 1988: Bush +34.5% | D+12.8 |
| 1984: Reagan +47.3% | R+2.5 |
| 1980: Reagan +44.8% | R+18.9 |
| 1976: Ford +25.9% | D+22.1 |
| 1972: Nixon +48.0% | R+3.9 |
| 1968: Nixon +44.1% | R+23.9 |
| 1964: Goldwater +20.2% | D+26.6 |
| 1960: Nixon +46.8% |
| 1956: Eisenhower |
| 1952: Eisenhower |
| 1948: Dewey |
| 1944: Dewey |
| 1940: Willkie |
| 1936: Landon |
| 1932: Hoover |
| 1928: Hoover |
| 1924: Coolidge |
| 1920: Harding |
| 1916: Hughes |
| 1912: Roosevelt (Bull Moose) |
| 1908: Taft |
| 1904: Roosevelt |
| 1900: McKinley |
| 1896: McKinley |
| 1892: Harrison |
| 1888: Harrison |
| 1884: Blaine |
| 1880: Garfield |
| 1876: Hayes |
| 1872: Grant |
| 1868: Grant |
| 1864: Lincoln |
| 1860: Lincoln |
| 1856: Fremont |
| 1852: Scott (Whig) |
| 1848: Taylor (Whig) |
| 1844: Clay (Whig) |
| 1840: Harrison (Whig) |
