Number of registered voters in Multnomah County: 504,955
| Date | Ballots Received | Cumulative | Turnout Percentage |
| 09/27/2016-10/20/2016 (early absentee) | 2,254 | 2,254 | 0.45% |
| Friday, 10/21/2016 | 979 | 3,232 | 0.64% |
| Monday, 10/24/2016 | 18,219 | 21,452 | 04.25% |
| Tuesday, 10/25/2016 | 34,201 | 55,653 | 11.02% |
| Wednesday, 10/26/2016 | 13,682 | 69,335 | 13.73% |
| Thursday, 10/27/2016 | 19,242 | 88,577 | 17.54% |
| Friday, 10/28/2016 | 11,016 | 99,593 | 19.72% |
| Monday, 10/31/2016 | 34,070 | 133,663 | 26.47% |
| Tuesday, 11/01/2016 | 19,811 | 153,474 | 30.39% |
| Wednesday, 11/02/2016 | 27,970 | 181,444 | 35.93% |
| Thursday, 11/03/2016 | 13,540 | 194,984 | 38.61% |
| Friday, 11/04/2016 | 22,206 | 217,190 | 43.01% |
| Saturday, 11/05/2016 | 25,566 | 242,756 | 48.07% |
| Monday, 11/07/2016 | 63,637 | 306,393 | 60.68% |
| Tuesday, (Election Day) 11/08/2016 | 97,666 | 404,059 | 80.01% |
Statewide turnout - daily ballot returns
Historical turnout: