| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 4,955 | 14,438 | 19,754 | |
| 2020 | R | 5,023 | 14,568 | 19,991 | |
| 2016 | R | 4,247 | 12,718 | 18,080 | |
| 2012 | R | 5,359 | 10,978 | 16,760 | |
| 2008 | R | 6,987 | 10,333 | 17,574 | |
| 2004 | R | 4,519 | 11,397 | 16,027 | |
| 2000 | R | 5,374 | 9,590 | 15,310 | |
| 1996 | R | 5,374 | 7,778 | 15,142 | |
| 1992 | R | 4,560 | 8,075 | 16,211 | |
| 1988 | R | 5,382 | 10,176 | 15,621 | |
| 1984 | R | 5,357 | 11,056 | 16,522 | |
| 1980 | R | 5,861 | 10,496 | 17,150 | |
| 1976 | R | 7,098 | 8,918 | 16,150 | |
| 1972 | R | 4,028 | 10,794 | 14,900 | |
| 1968 | R | 5,417 | 8,574 | 16,226 | |
| 1964 | D | 9,078 | 7,310 | 16,455 | |
| 1960 | R | 7,111 | 9,421 | 16,602 | |
| 1956 | R | 6,561 | 9,170 | 15,811 | |
| 1952 | R | 6,552 | 8,961 | 15,671 | |
| 1948 | D | 6,992 | 6,068 | 13,324 | |
| 1944 | R | 6,798 | 6,816 | 13,733 | |
| 1940 | D | 8,015 | 7,216 | 15,348 | |
| 1936 | D | 8,552 | 6,026 | 14,717 | |
| 1932 | D | 8,552 | 5,410 | 14,219 | |
| 1928 | R | 5,790 | 7,516 | 13,389 | |
| 1924 | R | 5,976 | 6,664 | 12,936 | |
| 1920 | D | 6,845 | 6,336 | 13,437 | |
| 1916 | D | 3,900 | 3,201 | 7,461 | |
| 1912 | D | 3,432 | 1,254 | 7,230 | |
| 1908 | D | 4,035 | 3,529 | 7,923 | |
| 1904 | R | 3,550 | 3,660 | 7,592 | |
| 1900 | D | 3,846 | 3,291 | 7,353 | |
| 1896 | D | 3,828 | 3,219 | 7,214 | |
| 1892 | D | 3,490 | 2,664 | 6,553 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Shelby County, southeast of Indianapolis, recorded an R+48 margin in 2024, reflecting the deep-red lean typical of rural south-central Indiana counties where small-town and agricultural communities dominate the electorate.
The Republican margin in Shelby County reached its widest at forty-eight points in 2024. The margin in 2024 was forty-eight points, in line with the county's deep historical pattern.
Shelby County's loyalty is rooted in its place. Median household income of $72,190, a 91% non-Hispanic-white share, and a population of 45,265 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Decatur County and Benton County.
