| 501 | Bensalem Development Company, Inc.Not reported | Corporation | Not reported | Not reported |
| 502 | S & S Mechanical Contractors, Inc.Not reported | Corporation | Not reported | Not reported |
| 503 | Icss IncorporatedNot reported | Corporation | Not reported | Not reported |
| 504 | Wilkening Enterprises, Ltd.Not reported | Corporation | Not reported | Not reported |
| 505 | Affinity Marketing Associates, Inc.Not reported | Corporation | Not reported | Not reported |
| 506 | Anr Enterprises Inc.Not reported | Corporation | Not reported | Not reported |
| 507 | The AssembliesNot reported | Nonprofit | Not reported | Not reported |
| 508 | Independent Computer Support Services L.p.Not reported | Partnership | Not reported | Not reported |
| 509 | Cpg Tile & Design, Inc.Not reported | Corporation | Not reported | Not reported |
| 510 | In Any Event, Inc.Not reported | Corporation | Not reported | Not reported |
| 511 | The World War Ii National Victory Forces, Inc.Not reported | Nonprofit | Not reported | Not reported |
| 512 | Omni Transport, Inc.Not reported | Corporation | Not reported | Not reported |
| 513 | Devecka Associates, Inc.Not reported | Corporation | Not reported | Not reported |
| 514 | The Direct Mail Board of Review, Inc.Not reported | Corporation | Not reported | Not reported |
| 515 | Sport Toyota, Inc.Not reported | Corporation | Not reported | Not reported |
| 516 | William Mechanical Service, Inc.Not reported | Corporation | Not reported | Not reported |
| 517 | Gilpac Enchantments, Ltd.Not reported | Corporation | Not reported | Not reported |
| 518 | Joseph R. Davison P.c.Not reported | Corporation | Not reported | Not reported |
| 519 | Clear Perceptions Inc.Not reported | Corporation | Not reported | Not reported |
| 520 | Advanced Voice Technologies, Inc.Not reported | Corporation | Not reported | Not reported |
| 521 | Main Line Hooker Service, Inc.Not reported | Corporation | Not reported | Not reported |
| 522 | The Fairwood Group Inc.Not reported | Corporation | Not reported | Not reported |
| 523 | Arlington Development CorporationNot reported | Corporation | Not reported | Not reported |
| 524 | Rv Green, Inc.Not reported | Corporation | Not reported | Not reported |
| 525 | The Bagel Factory, Inc.Not reported | Corporation | Not reported | Not reported |
| 526 | Abj of Pa, Inc.Not reported | Corporation | Not reported | Not reported |
| 527 | The Berwyn Bagel Factory, Inc.Not reported | Corporation | Not reported | Not reported |
| 528 | Ed Forde Service Center, Inc.Not reported | Corporation | Not reported | Not reported |
| 529 | Nova Carpet & Upholstery Cleaners, Inc.Not reported | Corporation | Not reported | Not reported |
| 530 | The Devon Stable Gallery, Inc.Not reported | Corporation | Not reported | Not reported |
| 531 | Andrew Robbins Builder, Inc.Not reported | Corporation | Not reported | Not reported |
| 532 | Devon Homes, Inc.Not reported | Corporation | Not reported | Not reported |
| 533 | Devon Fabrics, Inc.Not reported | Corporation | Not reported | Not reported |
| 534 | I.m. Associates, Inc.Not reported | Corporation | Not reported | Not reported |
| 535 | Chester County Leasing, Inc.Not reported | Corporation | Not reported | Not reported |
| 536 | A.r.e.a., Inc.Not reported | Corporation | Not reported | Not reported |
| 537 | F. W. Ward Co., Inc.Not reported | Corporation | Not reported | Not reported |
| 538 | Thomas C. Mccarthy Associates, Inc.Not reported | Corporation | Not reported | Not reported |
| 539 | Rcpii, Inc.Not reported | Corporation | Not reported | Not reported |
| 540 | R & D Construction Management Group, Inc.Not reported | Corporation | Not reported | Not reported |
| 541 | Shared Enterprises, Ltd.Not reported | Corporation | Not reported | Not reported |
| 542 | Manhattan Agency, Inc.Not reported | Corporation | Not reported | Not reported |
| 543 | Billmar's Cattery, Inc.Not reported | Corporation | Not reported | Not reported |
| 544 | Briar Hill Builders, Inc.Not reported | Corporation | Not reported | Not reported |
| 545 | Dad Vail Regatta Organizing CommitteeNot reported | Nonprofit | Not reported | Not reported |
| 546 | Delaware Valley Referral Associates, Inc.Not reported | Corporation | Not reported | Not reported |
| 547 | Success Dynamics, Inc.Not reported | Corporation | Not reported | Not reported |
| 548 | Halyard Development Co., Inc.Not reported | Corporation | Not reported | Not reported |
| 549 | Cheshire Construction CompanyNot reported | Corporation | Not reported | Not reported |
| 550 | Jemac Associates, Inc.Not reported | Corporation | Not reported | Not reported |