| County | Precincts | B. Foster | J. Oberweis | | Total | 568/568 | 52,010 53% | 46,988 47% | | Bureau | 3/3 | 45 47% | 51 53% | | DeKalb | 71/71 | 5,937 56% | 4,640 44% | | DuPage | 36/36 | 3,294 51% | 3,216 49% | | Henry | 24/24 | 1,046 38% | 1,678 62% | | Kane | 297/297 | 32,814 54% | 28,224 46% | | Kendall | 75/75 | 6,396 50% | 6,305 50% | | Lee | 49/49 | 1,959 44% | 2,449 56% | | Whiteside | 13/13 | 519 55% | 425 45% |
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