Longest losing streak for a county.

[Tartarus Sauce]

Found another county with a losing streak of 9 in addition to Greene County, NY.

Walker County, TX, 1876-1908, losing streak of 9. Voted third-party three times.

1876: Tilden
1880: Third Party
1884: Blaine
1888: Third Party
1892: Third Party (Weaver)
1896: Bryan
1900: Bryan
1904: Parker
1908: Bryan

Some other long losing streaks:

Barry County, MO, 1872-1900, losing streak of 8. Voted for one of the two major party nominees each time.

1872: Greeley
1876: Tilden
1880: Hancock
1884: Blaine
1888: Cleveland
1892: Harrison
1896: Bryan
1900: Bryan

Another losing streak of 8---Pierce County, NE, 1868-1896, voted third party once.
1868: Seymour
1872: Greeley
1876: Tilden
1880: Hancock
1884: Blaine
1888: Cleveland
1892: Third-Party (Weaver)
1896: Bryan

And another one---Churchill County, NV, 1872-1900. Voted third party once.
1872: Greeley
1876: Tilden
1880: Hancock
1884: Blaine
1888: Cleveland
1892: Third-Party (Weaver)
1896: Bryan
1900: Bryan

Here's where it gets interesting. Churchill County's vote was tied in 1868 between Grant and Seymour, while McLellan won the vote in 1864. If you count the 1868 tie vote as a losing vote, its losing streak is extended to ten, from 1864-1900, longer than both Greene County, NY and Walker County, TX.