I remember seeing the IA banner at around Q4 of each year. Sometimes they noted that the amount will be 100% or 200% matched by other generous donors, so any amount donated will have more impact. [1] is an example of the banner.
Internet Archive (2019 figures):
https://projects.propublica.org/nonprofits/organizations/943...
169 employees, total salary costs $10.9 million. Average per head: $70K.
Wikimedia Foundation (2019 figures):
https://projects.propublica.org/nonprofits/organizations/200...
291 employees, total salary costs $55.6 million.
Even if you allow that the WMF salary costs total will include some non-US employees in addition to the 291 US employees, per Schedule F in the Form 990 the non-US employees can at most have numbered 71 and were probably considerably less (many of those 71 will have been independent contractors rather than employees). Even if you assume that all non-US "employees, agents, and independent contractors" in Schedule F were employees whose salaries are included in the $55.6M total, you arrive at a per-head figure of $154K, more than twice the average of Internet Archive.
They are both located in San Francisco.