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Nassau County, New York

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1,008,838
Active registered voters
506,538
Supervoters (50.21%)
5
Presidential cycles of results

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

Nassau County, New York has 1,008,838 active registered voters — 30.4% Republican, 37.4% Democratic, and 28.5% with no party affiliation, as of June 2026.

Party registration

DEM 37.4%
REP 30.4%
NPA 28.5%
Democratic 377,804 · Republican 306,243 · No Party Affiliation 287,408 · Other parties 37,383
Source: Motion51 voter database — official New York voter file

How Nassau County voted for president

53.8
45.4
2008
52.9
46.2
2012
51.3
45.9
2016
54.1
44.6
2020
47.9
52.1
2024
■ Democratic %   ■ Republican %  ·  2024 total votes cast: 706,541

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 Nassau County · Pricing