Pennsylvania Registration Statistics, 2016-present

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It is interesting that from Nov 2017 to June 2020 the dems basically stopped the decline in their voter registration lead, went from +809k in Nov 2017 to +802k in June 2020, they even increased their lead in 2018 in the run-up to the mid terms, they resumed declining after June 2020 though.

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STATEWIDE
November 2019: Dems +813,876
February 2020: Dems +791,848
May 2020: Dems +809,164
August 2021: Dems +616,962

ALLEGHENY
November 2019: Dems +291,626
February 2020: Dems +268,000
May 2020: Dems +271,496
August 2021: Dems +268,065

BERKS
November 2019: Dems +13,437
February 2020: Dems +13,154
May 2020: Dems +13,367
August 2021: Dems +5,511

BUCKS
November 2019: Dems +11,409
February 2020: Dems +13,462
May 2020: Dems +15,449
August 2021: Dems +10,702

CENTRE
November 2019: Dems +2,741
February 2020: Dems +3,200
May 2020: Dems +3,617
August 2021: Dems +1,803

CHESTER
November 2019: Reps +6,966
February 2020: Reps +3,505
May 2020: Reps +310
August 2021: Dems +4,453

DAUPHIN
November 2019: Dems +10,356
February 2020: Dems +11,193
May 2020: Dems +12,068
August 2021: Dems +12,458

DELCO
November 2019: Dems +33,001
February 2020: Dems +37,092
May 2020: Dems +40,191
August 2021: Dems +49,709

LACKAWANNA
November 2019: Dems +42,051
February 2020: Dems +41,241
May 2020: Dems +41,058
August 2021: Dems +37,022

LEHIGH
November 2019: Dems +32,983
February 2020: Dems +33,857
May 2020: Dems +34,662
August 2021: Dems +31,888

LANCASTER
November 2019: Reps +60,777
February 2020: Reps +59,742
May 2020: Reps +58,771
August 2021: Reps +64,069

MONTGOMERY
November 2020: Dems +73,194
February 2020: Dems +78,843
May 2020: Dems +83,301
August 2021: Dems +92,522

PHILADELPHIA
November 2020: Dems +697,876
February 2020: Dems +702,439
May 2020: Dems +706,611
August 2021: Dems +687,816

Wtf happened this year? That’s a huge drop off in democrat support

In the leadup to the 2020 election Republicans registered more voters relative to democrats and after every election there is a post election purge where voters that no longer are in the state are removed, this affected more democrats than republicans.

[Annatar]

An update to this thread, as of the 4th of October which is the last date for which we have voter registration data from PA, the democratic lead is down 607,642, over 2 months from the start of August to the start of October, the lead has fallen by around 9,000. It is likely that in the next few months the democratic lead will go below 600,000 as ancestral democrats continue to pass away.