What is the inflation adjusted price of a us postage stamp compared to the cost in 1965?

9–10x the price! Hm.

There’s even a site for this.

0.05 –> 0.55

First Class today is $ 0.58 for up to an ounce and $ 0.78 for up to two ounce.

https://www.upi.com/Top_News/US/2021/05/28/USPS-postage-rates/9381622237623/

First class in 1965 was $0.05 and inflation rate from 1965 to today is about 9 . . . would be just inflation $0.45

Sending a letter through the mail is sill a bargain whatever it is. I love our USPS.

I think the USPS is the best govt. service we have. Provides service to almost every single American, rich or poor, for very low cost.