Langhorne 100
Langhorne Speedway
1 Mile Paved Oval
100 Laps/100 Miles
June 12, 1966
| Finish | Start | Driver | Car # | Sponsor/Name | Chassis | Engine | Laps | Status |
Points |
| 1 | 1 | Mario Andretti | 1 | Dean Van Lines | Brawner Hawk | Ford | 100 | 1:00:47.78 98.690 | 200 |
| 2 | 11 | Jim McElreath | 3 | Zink-Urschel-Slick | Brabham | Ford | 100 | Finished | 160 |
| 3 | 4 | Joe Leonard | 6 | Yamaha | Eagle | Ford | 100 | Finished | 140 |
| 4 | 2 | Don Branson | 4 | Leader Card | Watson D | Offy | 100 | Finished | 120 |
| 5 | 10 | Billy Foster | 27 | Jim Robbins | Vollstedt | Ford | 100 | Finished | 100 |
| 6 | 5 | Roger McCluskey | 8 | G. C. Murphy | Eagle | Ford | 100 | Finished | 80 |
| 7 | 12 | Bob Harkey | 81 | Central Excavating | Gerhardt | Offy | 99 | Flagged | 60 |
| 8 | 18 | Arnie Knepper | 85 | Caves Buick | Gerhardt | Offy SC | 98 | Flagged | 50 |
| 9 | 8 | Al Unser | 24 | American Red Ball | Lola | Ford | 98 | Flagged | 40 |
| 10 | 20 | Carl Williams | 25 | Dayton Steel Wheel | Watson FE | Offy | 97 | Flagged | 30 |
| 11 | 14 | Larry Dickson | 24 | Ken Brenn | Meskowski D | Offy | 97 | Flagged | 20 |
| 12 | 19 | Chuck Hulse | 12 | Wynn's | Watson | Ford | 97 | Flagged | 10 |
| 13 | 21 | Ronnie Duman | 96 | Harrison | Eisert | Chevy | 96 | Flagged | |
| 14 | 16 | Bobby Unser | 7 | Vita Fresh Orange Juice | Huffaker | Offy SC | 88 | Broken oil filter | |
| 15 | 9 | Sam Sessions | 40 | Federal Engineering | Trevis FE | Offy | 87 | Spun out | |
| 16 | 22 | Bob Hurt | 36 | Viking Racing | Gerhardt | Offy | 77 | Spun out | |
| 17 | 6 | Jim Hurtubise | 55 | Barnett Bros. | Kuzma FE | Offy | 71 | Spun out | |
| 18 | 13 | Bud Tingelstad | 22 | Federal Engineering | Gerhardt | Offy SC | 65 | Engine | |
| 19 | 7 | Gordon Johncock | 72 | Weinberger Homes | Gerhardt | Ford | 55 | Broken universal joint | |
| 20 | 3 | Gary Congdon | 54 | Valvoline | Huffaker | Offy | 55 | Broken gearbox | |
| 21 | 15 | George Snider | 82 | Sheraton-Thompson | Lotus | Ford | 27 | Spun out | |
| 22 | 17 | Art Pollard | 76 | Pure Firebird | Gerhardt | Offy SC | 26 | Spun out | |
| -- | -- | Dick Atkins | 58 | Nelson | Lesovsky D | Offy | -- | Did not qualify | |
| -- | -- | Dick Fries | 49 | Anson-Ring Free | Trout-Barnes | Offy | -- | Did not qualify | |
| -- | -- | Bruce Jacobi | 44 | Compton Motors | Vollstedt | Offy | -- | DNS, too slow | |
| -- | -- | Bruce Jacobi | 68 | Western Racing Associates | Lola | Chevy | -- | Wrecked practice | |
| -- | -- | Gig Stephens | 71 | Fairchild-Hiller | Halibrand | Offy | -- | Wrecked practice | |
| -- | -- | Gary Bettenhausen | 61 | McManus Brothers | Halibrand | Offy | -- | Did not qualify | |
| -- | -- | Bay Darnell | X | X | X | X | -- | Did not qualify | |
| -- | -- | Bobby Grim | 39 | Racing Associates | Watson FE | Offy | -- | Did not qualify | |
| -- | -- | John Hollansworth | 42 | Hollansworth | Epperly FE | Offy | -- | Did not qualify | |
| -- | -- | Bob King | 36 | Stahl Brothers | Kuzma D | Offy | -- | Did not qualify | |
| -- | -- | George Landry | X | X | X | X | -- | Did not qualify | |
| -- | -- | Don Meacham | X | X | X | X | -- | Did not qualify | |
| -- | -- | Dave Paul | 23 | Paul Enterprise | Halibrand | Offy | -- | Did not qualify |
| Lap Leaders | Total | Laps |
| Mario Andretti | 100 | 1-100 |