Jerome is a census-designated place in Somerset County, Pennsylvania, United States. The population was 1,068 at the 2000 census. It is part of the Johnstown, Pennsylvania Metropolitan Statistical Area. Jerome is part of the municipality of Conemaugh Township, Somerset County, Pennsylvania, as are nearby towns of Davidsville, Pennsylvania, Thomas Mills, Tire Hill, Seanor, Hiyasota and part of Holsopple. Jerome area code: 814; zip code: 15937. Jerome apartments for rent comparison page shows most up to date rent information on Jerome apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.