Tappan is in Rockland County. But Rockland County was carved from the southestern corner of the original Orange County about 1800 (the exact date escapes me at the moment and I'm too lazy to go look it up). Tappan has always occupied the same place regardless of the county name. Confusingly there is also an Old Tappan right across the line in Bergen County, New Jersey. Kelvin Kean Elverson, Pennsylvania