It varies from school to school, as does the size of the lectures, which can range from 40 students to 600 students. Some small, private colleges may not have any lecture halls at all while larger colleges may have entire buildings with only lecture halls inside.
Lecture halls are used for General Education Requirement classes that everyone (or at least a large portion of the school population) must take, such as low-level history, Biology, and math courses. Typically higher-level, specific courses (300 and 400 levels, which only one or two majors are required to take) are not taught in a lecture format, but in a much smaller, more personal style.
At least 120 colleges
Texas has a total of 208 Colleges and Universities .
It sponsors 80 colleges and Universities.
11 Colleges & Universities
12 colleges or universities
Actually there are 38 colleges and 6 permanent private halls. :) (on the University of oxford website)
208
81
30
none
6
I can tell you there are 3864 regionally accredited colleges and universities within the United States. However, there are many more.