These researchers turned in their surnames of interest for Van Buren Co. Genealogy. Many of the e-mails may be outdated and we have no way of catching them up unless the researcher contacts us.
| Surname | Township | Submitter |
| ODELL/ O'DELL | Van Buren Co. | Patti O'Dell |
| ODELL | Van Buren Co. | Georgie Mitchell |
| ODELL | Van Buren Co. | Joan Jaco |
| OLDS | Van Buren Co. | Anita L. Lotts |
| OLDS | Hartford Twp. | Richard Earl Olds |
| OLDS | Van Buren Co. | Joe Osborn |
| O'MALLEY | Van Buren Co. | A. Taylor |
| ORR | Decatur Twp. | Brenda Orr |
| ORR | Van Buren Co. | Joann Woodworth |
| ORR | Van Buren Co. | Michalene |
| ORR | Van Buren Co. | Laura DeRoo |
| ORSBORN | Van Buren Co. | Linda Coltrin |
| ORSBURN | Van Buren Co. | Linda Coltrin |
| OSBORN | Van Buren Co. | Marjorie Roti Roti |
| OSBORN | Van Buren Co. | Gordon F. Hammerstrom |
| OSBORN | Van Buren Co. | Linda Coltrin |
| OSBORNE/OSBORN | Van Buren Co. | Karen DeVries |
| OSBORNE | Van Buren Co. | Linda Coltrin |
| OTT | Van Buren Co. | Lisa Williamson |
| OTTEN |
Van Buren Co. | Dave Otten |
| OTTENE | Van Buren Co. | Jennifer Clark |
| OUSTERHOUT | Van Buren Co. | Gail Reynolds |
| OUTMAN | Van Buren Co. | Kevin J. Outman |
| OVERHISER | Bangor/South Haven | Kim Kester |
| OWEN | Van Buren Co. | Bill Owen |
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