United States Senate election in Florida, 2004 Polling Polling

| Poll_Source | Dates_administered | Sample_size | Margin_of_Error | Mel_Martinez_R | Betty_Castor_D |
|---|---|---|---|---|---|
| Zogby International | October 31 | 600 | ± 4.0% | 46% | 46% |
| Quinnipiac University | October 31 | 1098 | ± 3.0% | 49% | 44% |
| CNN / USA Today / Gallup | October 28 | 1138 | ± 4.0% | 46% | 48% |
| Mason Dixon | October 26 | 625 | ± 4.0% | 47% | 46% |
| New York Times | October 23 | 802 | ± 3.0% | 44% | 47% |
| Quinnipiac University | October 22 | 944 | ± 3.2% | 49% | 46% |
| Insider Advantage | October 22 | 400 | ± 5.0% | 46% | 44% |
| Survey USA | October 22 | 741 | ± 3.7% | 47% | 50% |
| Miami Herald | October 19 | 800 | ± 3.5% | 44% | 44% |
| Research 2000 | October 18 | 600 | ± 4.0% | 48% | 48% |