Two sources for school janitor or custodian jobs are Indeed.com and HigherEdJobs.com. Indeed.com is a generic job search website that allows you to search for janitor jobs within different educational institutions, whereas HigherEdJobs.com is focused on higher education jobs and includes postings for janitorial positions in colleges and universities.
Type "School Janitor" or "School Custodian" into the first box of Indeed's search engine, and type a location into the second box to search within a specific area. Leave the second box empty to pull up jobs from across the United States. Click the Find Jobs button, and then browse the list and click on entries to read about the positions and apply. You can also post your resume on the website for potential employers to view, and Indeed has a job alert service that allows you to receive notifications of new school janitorial jobs.
You can search for college or university janitorial jobs on Higher Ed Jobs by typing "Janitor" into the website's search engine. You can refine results by institution type or location with the tool box on the right-hand side of the results page. As with Indeed, click on entries to view job descriptions and requirements and to see application instructions. Higher Ed Jobs also has an advanced search engine to further refine results.