What are the largest number of pacs?

The largest number of PACs (Political Action Committees) in the United States can vary significantly from election cycle to election cycle. As of recent years, there have been thousands of registered PACs, with a notable increase during major election years. The exact number can fluctuate due to new formations, mergers, and deregistrations. For the most current statistics, one would typically refer to the Federal Election Commission (FEC) or similar organizations tracking campaign finance.