4-H Information Session at Mercer County Stables Mercer County, New Jersey sent this bulletin at 10/26/2018 11:20 AM EDT View as a webpage Sunday, Oct. 28 from 9 - 11 a.m. 4-H Information Session at Mercer County Stables Cal (609) 730-9059 with any questions or concerns. Mercer County, New Jersey Mercer County Administration Building 640 South Broad Street P.O. Box 8068 Trenton, NJ 08650-0068