Getting a referral from a current employee is a great way for a job candidate to stand out when applying to a company. And it's especially effective for getting into a firm that prioritizes recruiting via referrals.

So, which companies rely on referrals most? To find out, Switch On Business examined Glassdoor data on applicants who received job offers based on employee referrals.

An infographic (below) covers key findings from the research.

It looks at the 20 companies in the United States with the highest share of job offers made to candidates who received employee referrals.