| Old Fort, Ohio | |
| Settlement Type: | Census-designated place |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Type3: | Township |
| Subdivision Name3: | Pleasant |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 1.50 |
| Area Land Km2: | 1.50 |
| Area Water Km2: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 143 |
| Population Density Km2: | 95.61 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 686 |
| Coordinates: | 41.2419°N -83.1514°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 44861 |
| Blank Name: | FIPS code |
| Blank Info: | 39-58156 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2628948 |
Old Fort is a census-designated place located in northern Pleasant Township, Seneca County, Ohio, United States; located about a mile east of Ohio State Route 53 where N. Township Rd. 73 intersects with E. County Rd. 51. The ZIP code is 44861.[2] The population was 143 at the 2020 census.
Old Fort was platted in 1882, and named after Fort Seneca, a fort built during the War of 1812.[3] A post office has been in operation at Old Fort since 1882.[4]
Old Fort sits adjacent to the Sandusky River, which is a tributary to Lake Erie.