| Official Canvassed Results | County Supervisor | |||||||||
| Total | Janelle | Lori P. | James C. | |||||||
| Voters | Rettig (D) | Cardella (R) | Knapp (NP) | WI | Over | Under | ||||
| 1/26/2010 2:20 PM | 9,736 | 5,608 | 58% | 3,764 | 39% | 332 | 3% | 25 | 3 | 4 |
| IC01 Roosevelt | 68 | 52 | 76% | 14 | 21% | 2 | 3% | 0 | 0 | 0 |
| IC02 Horn | 144 | 80 | 56% | 57 | 40% | 7 | 5% | 0 | 0 | 0 |
| IC03 Quad | 31 | 18 | 58% | 10 | 32% | 3 | 10% | 0 | 0 | 0 |
| IC04 Lincoln | 212 | 164 | 77% | 44 | 21% | 4 | 2% | 0 | 0 | 0 |
| IC05 UI Library | 12 | 10 | 83% | 2 | 17% | 0 | 0% | 0 | 0 | 0 |
| IC06 Mercer | 173 | 98 | 57% | 71 | 41% | 4 | 2% | 0 | 0 | 0 |
| IC07 West High | 55 | 27 | 49% | 27 | 49% | 1 | 2% | 0 | 0 | 0 |
| IC08 Weber School | 230 | 113 | 49% | 111 | 48% | 5 | 2% | 1 | 0 | 0 |
| IC09 All Nations | 147 | 85 | 58% | 55 | 37% | 6 | 4% | 1 | 0 | 0 |
| IC10 MYEP | 93 | 63 | 68% | 28 | 30% | 2 | 2% | 0 | 0 | 0 |
| IC11 Courthouse | 19 | 14 | 74% | 5 | 26% | 0 | 0% | 0 | 0 | 0 |
| IC12 Grant Wood | 104 | 65 | 63% | 37 | 36% | 2 | 2% | 0 | 0 | 0 |
| IC13 City Transit | 53 | 38 | 72% | 14 | 26% | 1 | 2% | 0 | 0 | 0 |
| IC14 Mark Twain | 137 | 83 | 61% | 50 | 36% | 4 | 3% | 0 | 0 | 0 |
| IC15 SE Jr High | 110 | 71 | 65% | 34 | 31% | 5 | 5% | 0 | 0 | 0 |
| IC16 Lucas | 285 | 142 | 50% | 133 | 47% | 8 | 3% | 2 | 0 | 0 |
| IC17 Hoover | 270 | 179 | 67% | 80 | 30% | 10 | 4% | 0 | 0 | 1 |
| IC18 Longfellow | 234 | 183 | 78% | 38 | 16% | 13 | 6% | 0 | 0 | 0 |
| IC19 Rec Center | 19 | 10 | 53% | 7 | 37% | 2 | 11% | 0 | 0 | 0 |
| IC20 Senior Center | 62 | 49 | 79% | 9 | 15% | 4 | 6% | 0 | 0 | 0 |
| IC21 Horace Mann | 116 | 94 | 81% | 21 | 18% | 0 | 0% | 1 | 0 | 0 |
| IC22 Shimek | 187 | 119 | 64% | 63 | 34% | 5 | 3% | 0 | 0 | 0 |
| IC23 Regina | 223 | 154 | 69% | 62 | 28% | 6 | 3% | 1 | 0 | 0 |
| IC24 City High | 250 | 178 | 71% | 61 | 24% | 8 | 3% | 3 | 0 | 0 |
| IC25 Lemme | 278 | 160 | 58% | 112 | 40% | 6 | 2% | 0 | 0 | 0 |
| IOWA CITY TOTAL | 3,512 | 2,249 | 64% | 1,145 | 33% | 108 | 3% | 9 | 0 | 1 |
| Rettig (D) | Cardella (R) | Knapp (NP) | WI | Over | Under | |||||
| CV01 Central | 49 | 31 | 63% | 16 | 33% | 2 | 4% | 0 | 0 | 0 |
| CV02 Grant Wood AEA | 181 | 98 | 54% | 79 | 44% | 4 | 2% | 0 | 0 | 0 |
| CV03 Western Hills | 18 | 10 | 56% | 5 | 28% | 2 | 11% | 1 | 0 | 0 |
| CV04 Rec Center | 101 | 65 | 64% | 32 | 32% | 4 | 4% | 0 | 0 | 0 |
| CV05 NW Jr High | 91 | 47 | 52% | 34 | 37% | 10 | 11% | 0 | 0 | 0 |
| CV06 Wickham | 314 | 158 | 50% | 144 | 46% | 11 | 4% | 1 | 0 | 0 |
| BG Big Grove | 291 | 99 | 34% | 182 | 63% | 10 | 3% | 0 | 0 | 0 |
| CE Cedar | 94 | 27 | 29% | 64 | 68% | 3 | 3% | 0 | 0 | 0 |
| CC Clear Creek | 26 | 7 | 27% | 19 | 73% | 0 | 0% | 0 | 0 | 0 |
| FR Fremont | 81 | 22 | 27% | 57 | 70% | 2 | 2% | 0 | 0 | 0 |
| GR Graham | 53 | 13 | 25% | 30 | 57% | 10 | 19% | 0 | 0 | 0 |
| HD Hardin | 53 | 16 | 30% | 32 | 60% | 4 | 8% | 1 | 0 | 0 |
| JE Jefferson East | 136 | 54 | 40% | 79 | 58% | 3 | 2% | 0 | 0 | 0 |
| JW Jefferson West | 80 | 20 | 25% | 55 | 69% | 5 | 6% | 0 | 0 | 0 |
| LB Liberty | 88 | 31 | 35% | 50 | 57% | 7 | 8% | 0 | 0 | 0 |
| LN Lincoln | 18 | 7 | 39% | 11 | 61% | 0 | 0% | 0 | 0 | 0 |
| MD Madison | 61 | 16 | 26% | 43 | 70% | 2 | 3% | 0 | 0 | 0 |
| MN Monroe | 43 | 6 | 14% | 37 | 86% | 0 | 0% | 0 | 0 | 0 |
| NP Newport | 355 | 147 | 42% | 196 | 55% | 10 | 3% | 1 | 0 | 1 |
| NL01 NL Comm Center | 151 | 67 | 44% | 74 | 49% | 9 | 6% | 1 | 0 | 0 |
| NL02 NL Comm Center | 183 | 61 | 33% | 114 | 62% | 8 | 4% | 0 | 0 | 0 |
| OX Oxford | 151 | 31 | 21% | 111 | 74% | 6 | 4% | 3 | 0 | 0 |
| PN Penn | 246 | 118 | 48% | 117 | 48% | 10 | 4% | 1 | 0 | 0 |
| PV Pleasant Valley | 25 | 4 | 16% | 20 | 80% | 1 | 4% | 0 | 0 | 0 |
| SC Scott | 104 | 33 | 32% | 67 | 64% | 4 | 4% | 0 | 0 | 0 |
| SN Sharon | 63 | 13 | 21% | 50 | 79% | 0 | 0% | 0 | 0 | 0 |
| SO Solon | 183 | 87 | 48% | 83 | 45% | 12 | 7% | 1 | 0 | 0 |
| TF Tiffin | 65 | 27 | 42% | 34 | 52% | 4 | 6% | 0 | 0 | 0 |
| UN Union | 89 | 35 | 39% | 50 | 56% | 4 | 4% | 0 | 0 | 0 |
| UH Univ. Heights | 87 | 57 | 66% | 23 | 26% | 6 | 7% | 1 | 0 | 0 |
| WS Washington | 66 | 15 | 23% | 51 | 77% | 0 | 0% | 0 | 0 | 0 |
| WL West Lucas | 50 | 19 | 38% | 30 | 60% | 1 | 2% | 0 | 0 | 0 |
| TOTAL OUTSIDE IC | 3,596 | 1,441 | 40% | 1,989 | 55% | 154 | 4% | 11 | 0 | 1 |
| EARLY VOTING | 2,628 | 1,918 | 73% | 630 | 24% | 70 | 3% | 5 | 3 | 2 |
| Turnout | 11.02% | Rettig (D) | Cardella (R) | Knapp (NP) | WI | Over | Under | |||
| GRAND TOTAL | 9,736 | 5,608 | 58% | 3,764 | 39% | 332 | 3% | 25 | 3 | 4 |