TO APPLY FOR A CIVILIAN ABSENTEE OR MAIL-IN BALLOT ONLINE WITH A PA ID, CLICK HERE.

You may vote by mail-in ballot, unless you qualify as an absentee voter, in which case you must vote by absentee ballot. If you want to vote by mail you must apply for a mail-in ballot. You do not need to provide a reason or excuse if you want to use a mail-in ballot. The county must receive your application for a mail-in ballot by 5pm on the Tuesday before the election, however, Don't wait until the last minute!

This graphic was from the 11/2020 General Election, but the info is still correct except for the date:

You can return your voted mail-in ballot by mailing it to your county board of elections using the envelope provided, or you can drop it off in person at the Board of Elections office:

MontCo Board of Elections
PO Box 311
Norristown, PA 19404-0311
Phone: 610-278-3000
Hours 8:30am - 4:15pm

[If necessary, this section will be updated, but as of 8/4/2021, it is correct]

You may also ask to be placed on a permanent mail-in voter list. If you are on this list, you will have a mail-in ballot application mailed to you by the first Monday in February each year. If you complete and return the application, the county will send you ballots in the mail for all the elections that take place that year, as well as for any special election held through the third Monday in February of the next year. For example, if you return your completed mail-in application in February 2020, you will automatically receive a ballot for the Primary and the November 3, 2020, General Election, as well as ballots for any special elections held on or before February 15, 2021.

If you are sent a mail-in ballot and the county receives your voted ballot by the deadline (postmarked by election day), you may not vote at your polling place. Your vote is considered final at that point. However, if you mailed your ballot too late, or you aren’t sure whether the county received your voted ballot in time, you may be able to vote a provisional ballot at your polling place. If you were sent a mail-in ballot, but your polling place has no record of having received it, you may vote by provisional ballot. However, if the county does receive your voted mail-in ballot in time, that ballot, not your provisional ballot, will be counted. Remember, you may always return your mail-in ballot at the county board of election’s office by 8pm on election day.

Finally, counties are authorized to begin processing mail-in applications more than 50 days before the election. Beginning 50 days before the election, counties must begin transmitting mail-in ballots as soon as the ballot is certified and the ballots are available. Counties may await the result of a court proceeding that would affect the content of ballots before delivering mail-in ballots, but in any case, counties must begin to send out mail-in and absentee ballots no later than the second Tuesday before the election.