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Seneca County, New York

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20,830
Active registered voters
11,185
Supervoters (53.7%)
5
Presidential cycles of results

Data as of June 19, 2026 · refreshed automatically from the official New York voter file

Seneca County, New York has 20,830 active registered voters — 39.3% Republican, 27.6% Democratic, and 26.3% with no party affiliation, as of June 2026.

Party registration

DEM 27.6%
REP 39.3%
NPA 26.3%
Democratic 5,758 · Republican 8,188 · No Party Affiliation 5,473 · Other parties 1,411
Source: Motion51 voter database — official New York voter file

How Seneca County voted for president

50.3
47.7
2008
53.7
44.5
2012
40.7
52.8
2016
44.2
53.3
2020
44.1
55.9
2024
■ Democratic %   ■ Republican %  ·  2024 total votes cast: 14,989

Election results are public records.

Source:  Official county canvasses via MIT Election Data + Science Lab

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Also see: Motion51 in New York · How to run for office in Seneca County · Pricing