This study assessed the prevalence of cervical spondylolisthesis in patients undergoing radiographic studies for reasons unrelated to their cervical spine. Scout lateral cervical spine radiographs of 174 patients who had barium swallows were reviewed for the degree and level of cervical spondylolisthesis. Nine patients were found to have >2 mm of anterior subluxation of the cervical spine for a prevalence of 5.2%. Two patients had involvement at the C2-C3 level, one patient at C3-C4, four patients at C4-C5, one patient at C5-C6, and one patient at C7-T1. Subluxation ranged from 2 to 4 mm. Posterior subluxation (retrolisthesis) was not found in any patient. None of the nine patients with spondylolisthesis had complaints of neck pain or upper extremity symptoms, and none had a history of rheumatoid arthritis or cervical trauma.