Sand Hill is an unincorporated community and census-designated place in Lebanon County, Pennsylvania, United States. The population was 2,496 at the 2010 census. Sand Hill is located in central Lebanon County, in main North Lebanon Township. It is bordered to the south by the city of Lebanon, the county seat. The Sand Hill CDP includes the neighborh…Sand Hill is an unincorporated community and census-designated place in Lebanon County, Pennsylvania, United States. The population was 2,496 at the 2010 census. Sand Hill is located in central Lebanon County, in main North Lebanon Township. It is bordered to the south by the city of Lebanon, the county seat. The Sand Hill CDP includes the neighborhoods of Sand Hill, Sunset, and Reinohlsville. Pennsylvania Route 343 passes through the community, leading north 6 miles to Fredericksburg and south into Lebanon.