| Business | Phone |
| A G Lichtenstein & Assoc 1 Oxford Vly # 818, Langhorne 19047 | (215) 752-2206 |
| D S Winokur Assoc Inc 2080 Cabot Blvd W # 204, Langhorne 19047 | (215) 750-9900 |
| Tri-State Engineers & Land Inc 801 W Street Rd, Langhorne 19053 | (215) 357-5950 |
| ACRE Engineers & Land Surveyors 52 Woodbridge Court North, Langhorne 19053 | (215) 752-2000 |