| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 100,446 | 25,223 | 129,561 | |
| 2020 | D | 105,344 | 22,318 | 130,699 | |
| 2016 | D | 92,016 | 20,186 | 121,339 | |
| 2012 | D | 81,269 | 34,474 | 117,608 | |
| 2008 | D | 78,994 | 29,876 | 110,153 | |
| 2004 | D | 63,987 | 29,635 | 94,650 | |
| 2000 | D | 50,260 | 28,555 | 83,559 | |
| 1996 | D | 45,573 | 26,106 | 75,376 | |
| 1992 | D | 47,756 | 26,376 | 82,584 | |
| 1988 | D | 40,314 | 34,191 | 75,365 | |
| 1984 | D | 37,031 | 34,848 | 72,242 | |
| 1980 | R | 26,502 | 30,854 | 66,861 | |
| 1976 | D | 32,536 | 30,972 | 64,599 | |
| 1972 | R | 25,877 | 39,406 | 66,383 | |
| 1968 | R | 26,107 | 28,163 | 61,326 | |
| 1964 | D | 33,567 | 20,485 | 54,363 | |
| 1960 | R | 22,095 | 23,632 | 45,977 | |
| 1956 | R | 16,674 | 21,868 | 39,725 | |
| 1952 | R | 14,032 | 22,158 | 36,380 | |
| 1948 | R | 7,798 | 10,774 | 20,111 | |
| 1944 | R | 7,122 | 8,317 | 15,499 | |
| 1940 | D | 5,440 | 4,365 | 9,862 | |
| 1936 | D | 4,971 | 2,825 | 7,835 | |
| 1932 | D | 3,285 | 2,806 | 6,234 | |
| 1928 | R | 1,444 | 4,274 | 5,718 | |
| 1924 | R | 1,209 | 1,307 | 2,921 | |
| 1920 | R | 835 | 997 | 1,870 | |
| 1916 | D | 515 | 412 | 950 | |
| 1912 | D | 394 | 125 | 809 | |
| 1908 | D | 354 | 165 | 522 | |
| 1904 | D | 157 | 99 | 257 | |
| 1900 | R | 413 | 421 | 836 | |
| 1896 | R | 322 | 713 | 1,039 | |
| 1892 | D | 1,169 | 1,069 | 2,298 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
A dense, highly educated suburb directly across the Potomac from Washington, D.C., Arlington has delivered Democratic presidential margins exceeding 50 points in each of the last three cycles, making it one of the most lopsided jurisdictions in Virginia.
The Democratic margin in Arlington County reached its widest at sixty-four points in 2020. The margin in 2024 was fifty-eight points — still decisive.
Arlington County's loyalty is rooted in its place. Median household income of $142,114, a 60% non-Hispanic-white share, and a population of 236,254 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 Alexandria city and Charlottesville city.
