| 51 | Accelerated Transport - Pony Express IncNot reported | Corporation | Not reported | Not reported |
| 52 | Access CorporationNot reported | Corporation | Not reported | Not reported |
| 53 | Accident Index Bureau, Inc.Not reported | Corporation | Not reported | Not reported |
| 54 | Accounting Service CompanyNot reported | Corporation | Not reported | Not reported |
| 55 | Accurate Bonding Systems, Inc.Not reported | Corporation | Not reported | Not reported |
| 56 | Ace Cleaners and Reconditioners of Athletic Equipment, Inc.Not reported | Corporation | Not reported | Not reported |
| 57 | Ace Construction CompanyNot reported | Corporation | Not reported | Not reported |
| 58 | Acheson Industries, Inc.Not reported | Corporation | Not reported | Not reported |
| 59 | Acme Athletic Supply Co.Not reported | Corporation | Not reported | Not reported |
| 60 | Acme Auto Parts, Inc.Not reported | Corporation | Not reported | Not reported |
| 61 | Acme Fabricators & Weldors, Inc.Not reported | Corporation | Not reported | Not reported |
| 62 | Acme Newspapers, Inc.Not reported | Corporation | Not reported | Not reported |
| 63 | Inx International Ink Co.Not reported | Corporation | Not reported | Not reported |
| 64 | Acme Publishers Organization IncNot reported | Corporation | Not reported | Not reported |
| 65 | Acme Scrap Metals IncNot reported | Corporation | Not reported | Not reported |
| 66 | Acme Cryogenics, Inc.Not reported | Corporation | Not reported | Not reported |
| 67 | Ardent Premium Plan, Inc.Not reported | Corporation | Not reported | Not reported |
| 68 | Acme Title Agency IncNot reported | Corporation | Not reported | Not reported |
| 69 | Airlines Reporting CorporationNot reported | Corporation | Not reported | Not reported |
| 70 | Acorn Construction CompanyNot reported | Corporation | Not reported | Not reported |
| 71 | Action Printing Corp.Not reported | Corporation | Not reported | Not reported |
| 72 | Active Crane Rentals, Inc.Not reported | Corporation | Not reported | Not reported |
| 73 | Activities Association of Farm Bureau--harrisburg RegionNot reported | Nonprofit | Not reported | Not reported |
| 74 | Activities Association of Farm Bureau Insurance Companies--harrisburg RegionNot reported | Nonprofit | Not reported | Not reported |
| 75 | Actmedia, Inc.Not reported | Corporation | Not reported | Not reported |
| 76 | Ad-cap Press IncNot reported | Corporation | Not reported | Not reported |
| 77 | Transco Rail Services Us Inc.Not reported | Corporation | Not reported | Not reported |
| 78 | Adco Enterprises, Inc.Not reported | Corporation | Not reported | Not reported |
| 79 | Addictive Disease ClinicNot reported | Nonprofit | Not reported | Not reported |
| 80 | Adeptic Management Services, Inc.Not reported | Corporation | Not reported | Not reported |
| 81 | Adeptic Services, Inc.Not reported | Corporation | Not reported | Not reported |
| 82 | Chas Adler & Son, Inc.Not reported | Corporation | Not reported | Not reported |
| 83 | Admiral Travel Service IncNot reported | Corporation | Not reported | Not reported |
| 84 | Admiralty, Inc.Not reported | Corporation | Not reported | Not reported |
| 85 | Admons, Inc.Not reported | Corporation | Not reported | Not reported |
| 86 | Adora Products CorpNot reported | Corporation | Not reported | Not reported |
| 87 | Advance Tech Marketing, Inc.Not reported | Corporation | Not reported | Not reported |
| 88 | Advantage, Inc.Not reported | Corporation | Not reported | Not reported |
| 89 | Adventure in Cinemas, Inc.Not reported | Corporation | Not reported | Not reported |
| 90 | Instantwhip Pennsylvania, Inc.Not reported | Corporation | Not reported | Not reported |
| 91 | Aerial Agricultural Service of Montana IncNot reported | Corporation | Not reported | Not reported |
| 92 | Aeronca, Inc.Not reported | Corporation | Not reported | Not reported |
| 93 | Aerosol Technology CorporationNot reported | Corporation | Not reported | Not reported |
| 94 | Presidential Coach, Inc.Not reported | Corporation | Not reported | Not reported |
| 95 | Clariant CorporationNot reported | Corporation | Not reported | Not reported |
| 96 | Agavol Chemicals IncNot reported | Corporation | Not reported | Not reported |
| 97 | Agem, Inc.Not reported | Corporation | Not reported | Not reported |
| 98 | Agency Management CorpNot reported | Corporation | Not reported | Not reported |
| 99 | Aggressive Candy Sales, Inc.Not reported | Corporation | Not reported | Not reported |
| 100 | Agricultural Research Foundation IncNot reported | Corporation | Not reported | Not reported |