Two cases of campylobacteriosis were linked to the consumption of raw milk produced by a dairy in Park County, Wyoming. The two were from different households. Another outbreak of Campylobacter occurred in this county one year before. The milk involved in that outbreak was from a different dairy than the milk implicated in this outbreak. Milk samples were collected and tested negative for Campylobacter. Other possible links between the ill persons were investigated, but no other associations were found.