List of the largest optical telescopes in North America

This is a list of the largest optical telescopes in North America.

21st century
A list of optical telescopes located in North America by aperture.

Refractors
Some of the big traditional refractors (telescope with lens) in North America:

Biggest telescopes in 1950
Optical telescopes only

Biggest telescopes in 1850
Some of the largest at observatories: