| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 31,917 | 49,783 | 83,453 | |
| 2020 | R | 32,604 | 53,802 | 88,505 | |
| 2016 | R | 22,595 | 48,326 | 76,168 | |
| 2012 | R | 21,112 | 44,312 | 66,761 | |
| 2008 | R | 24,548 | 39,728 | 64,955 | |
| 2004 | R | 13,548 | 38,430 | 52,302 | |
| 2000 | R | 10,786 | 28,651 | 40,221 | |
| 1996 | R | 9,392 | 22,293 | 35,303 | |
| 1992 | R | 7,071 | 18,373 | 33,136 | |
| 1988 | R | 7,643 | 22,090 | 29,803 | |
| 1984 | R | 6,659 | 21,307 | 28,135 | |
| 1980 | R | 7,412 | 19,366 | 28,117 | |
| 1976 | R | 9,066 | 16,725 | 26,104 | |
| 1972 | R | 4,384 | 17,699 | 22,153 | |
| 1968 | R | 5,155 | 12,597 | 21,032 | |
| 1964 | R | 8,857 | 11,497 | 20,405 | |
| 1960 | R | 6,481 | 12,490 | 19,066 | |
| 1956 | R | 5,521 | 10,578 | 16,129 | |
| 1952 | R | 4,793 | 9,712 | 14,586 | |
| 1948 | R | 4,280 | 6,327 | 10,682 | |
| 1944 | R | 4,297 | 6,673 | 11,039 | |
| 1940 | R | 4,883 | 6,782 | 11,710 | |
| 1936 | R | 5,237 | 5,776 | 11,097 | |
| 1932 | R | 5,293 | 5,317 | 10,817 | |
| 1928 | R | 3,181 | 5,954 | 9,190 | |
| 1924 | R | 3,489 | 5,766 | 9,449 | |
| 1920 | R | 4,192 | 6,293 | 10,630 | |
| 1916 | R | 2,453 | 3,046 | 5,733 | |
| 1912 | D | 2,372 | 1,439 | 5,503 | |
| 1908 | R | 2,571 | 3,231 | 5,953 | |
| 1904 | R | 2,164 | 3,434 | 5,838 | |
| 1900 | R | 2,359 | 3,426 | 5,943 | |
| 1896 | R | 2,365 | 3,409 | 5,872 | |
| 1892 | R | 2,028 | 3,020 | 5,359 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Hendricks County has seen some of Indiana's sharpest population growth as households relocate from Marion County, yet that demographic churn has done little to soften its consistent 20-point Republican presidential margins.
The Republican margin in Hendricks County reached its widest at sixty points in 1972. The margin in 2024 was twenty-one points, in line with the county's deep historical pattern.
Hendricks County's loyalty is rooted in its place. Median household income of $101,144, a 78% non-Hispanic-white share, and a population of 183,344 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 Ottawa County and Boone County.
