Last updated: Sep 18, 2024

Pennsylvania

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Department of State

Data Visualizations

Voter Registration

These plots show the week-by-week change in the total number of registered voters in Pennsylvania, with voters split into three categories: registered Republicans, registered Democrats, and all other registered voters.

About the Data

The data are acquired from the Secretary of State's office at this website (as of September 10, 2024, they are obtained by clicking on the link "Voter registration statistics by county"). The date that the data were last updated is displayed at the top of the first sheet of the file, and the timestamps indicate that they are updated every Monday.

About our Process

We compute the net change from one week to the next by subtracting the number of registered voters of a given party in that week from the number of registered voters of that party in the previous week's file. Voters affiliated with another party or no party are combined into our Other category.

The net change that we plot is distinct from the number of new registrants of a given party. Those two numbers can appear substantively different: for example, if more Democrats register than Republicans in a given week, while in the same week more Pennsylvanians cease being registered Democrats than registered Republicans, then the net change would appear different from the raw number of new registrants. When Democrats experience a greater net decrease or a smaller net increase than Republicans, it may partly be attributable to the larger number of Democrats in Pennsylvania overall, but measuring the differential rate in attrition between registered voters of the two parties would require individual-level data; for example, from the Pennsylvania voter file.

Last updated: September 10, 2024

This graph shows the weekly net changes to Pennsylvania's voter registration totals, starting in mid-July and continuing through early September. Voters are split into three categories: registered Republicans, registered Democrats, and all other registered voters, and the net change is the week-by-week difference in the total number of voters registered in each of these categories. There has consistently been a larger net increase in Republicans than in Democrats or Other voters, with Republicans typically netting about 1,000 to 2,000 more voters than Democrats in recent weeks. Republicans have ranged from adding about 3,000 to 7,000 net registrants every month, while Democrats have ranged from losing 2,000 net voters in the second-last week of July to gaining about 5,000 in the last week of July, and the number of Other voters has increased by about 4,000 every week with comparatively little variation. — This graph shows the weekly *net changes* to Pennsylvania's voter registration totals, starting in mid-July and continuing through early September. Voters are split into three categories: registered Republicans, registered Democrats, and all other registered voters. The net change is the week-by-week difference in the total number of voters registered in each of these categories. There has consistently been a larger net increase in Republicans than in Democrats or Other voters, with Republicans typically netting about 1,000 to 2,000 more voters than Democrats in recent weeks. Republicans have ranged from adding about 3,000 to 7,000 net registrants every month, while Democrats have ranged from losing 2,000 net voters in the second-last week of July to gaining about 5,000 in the last week of July, and the number of Other voters has increased by about 4,000 every week with comparatively little variation.

Mail Ballot Status

Last updated: September 18, 2024

The number of people on the Pennsylvania statewide mail ballot file since July 1, broken down by party. The number of Democrats who will receive a mail ballot has risen from about 600,000 on July 1 to over 800,000 today, whereas the number of Republicans has grown from just over 200,000 to just over 300,000, and all other voters from about 70,000 to about 130,000. Almost no mail ballots have been returned.