A household could be an individual or a couple. I don't know where you're getting your income numbers, but the median HOUSEHOLD income in Columbia is $61,847/year. That makes house prices relatively affordable in Columbia.
https://www.deptofnumbers.com/income/missouri/columbia/#:~:text=The%20Census%20ACS%201-year%20survey%20reports%20that%20the,was%20%2461%2C781%20in%202021%2C%20the%20latest%20figures%20available.