| Teams 2003 Sam's Town 300 |
|---|
| No. | Team | Driver | Mfg |
|---|---|---|---|
| 1 | Phoenix Racing | Jamie McMurray | Chevrolet |
| 2 | Richard Childress Racing | Ron Hornaday, Jr. | Chevrolet |
| 4 | Biagi DenBeste Racing | Mike Wallace | Chevrolet |
| 5 | Hendrick Motorsports | Brian Vickers | Chevrolet |
| 6 | Tommy Baldwin Racing | Damon Lusk | Dodge |
| 7 | Evans Motorsports | Randy LaJoie | Chevrolet |
| 8 | Chance 2 Motorsports | Steve Park | Chevrolet |
| 9 | Roush Racing | Jeff Burton | Ford |
| 10 | ppc Racing | Scott Riggs | Ford |
| 12 | FitzBradshaw Racing | Kerry Earnhardt | Chevrolet |
| 16 | Day Enterprise Racing | Larry Gunselman | Chevrolet |
| 17 | Reiser Enterprises | Matt Kenseth | Ford |
| 18 | Joe Gibbs Racing | Coy Gibbs | Chevrolet |
| 19 | Braun Motorsports | Chad Blount | Dodge |
| 20 | Joe Gibbs Racing | Mike Bliss | Chevrolet |
| 21 | Richard Childress Racing | Kevin Harvick | Chevrolet |
| 22 | Bost Motorsports | Regan Smith | Chevrolet |
| 23 | Bill Davis Racing | Scott Wimmer | Chevrolet |
| 25 | Team Rensi Motorsports | Bobby Hamilton, Jr. | Ford |
| 26 | Carroll Racing | Kevin Grubb | Dodge |
| 27 | Brewco Motorsports | Chase Montgomery | Pontiac |
| 33 | BACE Motorsports | Tony Raines | Chevrolet |
| 37 | Brewco Motorsports | David Green | Pontiac |
| 38 | Akins Motorsports | Kasey Kahne | Ford |
| 39 | Jay Robinson Racing | Clint Vahsholtz | Ford |
| 43 | Baker Curb Racing | Johnny Sauter | Chevrolet |
| 44 | GIC-Mixon Motorsports | Mike Harmon | Chevrolet |
| 46 | Lewis Motorsports | Ashton Lewis | Chevrolet |
| 48 | Innovative Motorsports | Shane Hmiel | Chevrolet |
| 49 | Jay Robinson Racing | Chris Bingham | Ford |
| 54 | Team Bristol Motorsports | Hermie Sadler | Chevrolet |
| 57 | ppc Racing | Jason Keller | Ford |
| 59 | Frank Schwantz | Stacy Compton | Chevrolet |
| 60 | Roush Racing | Stanton Barrett | Ford |
| 70 | KAR Racing | Robby Benton | Chevrolet |
| 71 | Young Racing | Ron Young | Chevrolet |
| 73 | Daryl Spoerl | Jason Schuler | Ford |
| 77 | Moy Racing | Bruce Bechtel | Ford |
| 79 | John Aramendia | Joe Aramendia | Chevrolet |
| 87 | NEMCO Motorsports | Joe Nemechek | Chevrolet |
| 91 | Stanton Barrett Motorsports | Eddie McKean | Ford |
| 92 | Herzog Jackson Motorsports | Todd Bodine | Chevrolet |
| 99 | Michael Waltrip Racing | Michael Waltrip | Chevrolet |