My current public library job is in an area known as south central King County, where many individuals experience the challenge of homelessness. Official counts cite Seattle and the King County area as having the third highest population of homeless people in the country (as of 2017, the last official census count).
And we experience that reality in the libraries where I work.
What does that mean? It means that people sleep outside of the library doors in anticipation of opening. That there are uncomfortable bodily smells (of varying intensities) throughout the library. It means that people come in laden with bags and carts and animals, which take up extra chairs, tables, and computer space. That often the root of homelessness is connected with mental illness and/or addiction, and this means behavioral issues in libraries are not uncommon.