The list is the FIPS codes of Ohio counties. All the FIPS codes are starting with 39.
| County | FIPS Code |
| Adams | 39001 |
| Allen | 39003 |
| Ashland | 39005 |
| Ashtabula | 39007 |
| Athens | 39009 |
| Auglaize | 39011 |
| Belmont | 39013 |
| Brown | 39015 |
| Butler | 39017 |
| Carroll | 39019 |
| Champaign | 39021 |
| Clark | 39023 |
| Clermont | 39025 |
| Clinton | 39027 |
| Columbiana | 39029 |
| Coshocton | 39031 |
| Crawford | 39033 |
| Cuyahoga | 39035 |
| Darke | 39037 |
| Defiance | 39039 |
| Delaware | 39041 |
| Erie | 39043 |
| Fairfield | 39045 |
| Fayette | 39047 |
| Franklin | 39049 |
| Fulton | 39051 |
| Gallia | 39053 |
| Geauga | 39055 |
| Greene | 39057 |
| Guernsey | 39059 |
| Hamilton | 39061 |
| Hancock | 39063 |
| Hardin | 39065 |
| Harrison | 39067 |
| Henry | 39069 |
| Highland | 39071 |
| Hocking | 39073 |
| Holmes | 39075 |
| Huron | 39077 |
| Jackson | 39079 |
| Jefferson | 39081 |
| Knox | 39083 |
| Lake | 39085 |
| Lawrence | 39087 |
| Licking | 39089 |
| Logan | 39091 |
| Lorain | 39093 |
| Lucas | 39095 |
| Madison | 39097 |
| Mahoning | 39099 |
| Marion | 39101 |
| Medina | 39103 |
| Meigs | 39105 |
| Mercer | 39107 |
| Miami | 39109 |
| Monroe | 39111 |
| Montgomery | 39113 |
| Morgan | 39115 |
| Morrow | 39117 |
| Muskingum | 39119 |
| Noble | 39121 |
| Ottawa | 39123 |
| Paulding | 39125 |
| Perry | 39127 |
| Pickaway | 39129 |
| Pike | 39131 |
| Portage | 39133 |
| Preble | 39135 |
| Putnam | 39137 |
| Richland | 39139 |
| Ross | 39141 |
| Sandusky | 39143 |
| Scioto | 39145 |
| Seneca | 39147 |
| Shelby | 39149 |
| Stark | 39151 |
| Summit | 39153 |
| Trumbull | 39155 |
| Tuscarawas | 39157 |
| Union | 39159 |
| Van Wert | 39161 |
| Vinton | 39163 |
| Warren | 39165 |
| Washington | 39167 |
| Wayne | 39169 |
| Williams | 39171 |
| Wood | 39173 |
| Wyandot | 39175 |
All codes are cited from United States Department of Agriculture [28].