| President Republican | 100.% ( 1801 of 1801 ) precincts reporting as of Mar 4, 2008, at 9:49 a.m. County Returns Other Contests | | San Diego County Results | |
| |
| | Mike Huckabee (Rep) | 28,398 | 9.3 % |   | 328,387 | 11.6 % |   |
| | Duncan Hunter (Rep) | 6,747 | 2.3 % |   | 13,682 | 0.4 % |   |
| | Alan Keyes (Rep) | 900 | 0.2 % |   | 11,362 | 0.4 % |   |
| | Sam Brownback (Rep) | 152 | 0.0 % |   | 2,426 | 0.0 % |   |
| | John H. Cox (Rep) | 200 | 0.0 % |   | 3,101 | 0.1 % |   |
| | Rudy Giuliani (Rep) | 10,992 | 3.6 % |   | 126,415 | 4.5 % |   |
| | John McCain (Rep) | 122,095 | 40.0 % |   | 1,197,757 | 42.3 % |   |
| | Ron Paul (Rep) | 12,635 | 4.2 % |   | 120,374 | 4.3 % |   |
| | Mitt Romney (Rep) | 119,479 | 39.2 % |   | 980,969 | 34.6 % |   |
| | Tom Tancredo (Rep) | 243 | 0.0 % |   | 3,810 | 0.1 % |   |
| | Fred Thompson (Rep) | 3,658 | 1.2 % |   | 49,318 | 1.7 % |   |
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