How people identify politically:

WASHINGTON, D.C. -- On average, Americans' political party preferences in 2021 looked similar to prior years, with slightly more U.S. adults identifying as Democrats or leaning Democratic (46%) than identified as Republicans or leaned Republican (43%).

-gallup polls

https://news.gallup.com/poll/388781/political-party-preferences-shifted-greatly-during-2021.aspx

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Party registration

As of October 2022, 48 million registered voters in these areas identified themselves as Democrats. At 38.78%, Democrats represented the single largest share of registered voters in the states and territories that allow voters to indicate partisan affiliation on their registration forms.

A total of 36.4 million registered voters identified themselves as Republicans, representing 29.42% of registered voters in these areas.

A total of 35.3 million registered voters identified themselves as independents or unaffiliated with any political party. This amounted to 28.55% of registered voters in these areas.

-ballotopedia

https://ballotpedia.org/Partisan_affiliations_of_registered_voters

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49m democrats & 38.8m republicans (registered)

https://worldpopulationreview.com/state-rankings/registered-voters-by-party