Founded on Feb 7, 1835, Jay County is one of 92 counties in the state of Indiana. Historically, Jay County was formed from Adams New Purchase. The city of Portland is the county seat. With FIPS code of 75, Jay County has a population of 20,248 and area of 384 square miles (995 km2).
List of all cities in Jay County, IN alphabetically
| City/Town | Postal Code | Area Code |
| Antiville, IN | 47371 | 260 |
| Balbee, IN | 47369 | 260 |
| Bellefountain, IN | 47371 | 260 |
| Blaine, IN | 47371 | 260 |
| Bluff Point, IN | 47371 | 260 |
| Boundry, IN | 47371 | 260 |
| Brice, IN | 47371 | 260 |
| Bryant, IN | 47326 | 260 |
| College Corner, IN | 47371 | 260 |
| Collett, IN | 47371 | 260 |
| Como, IN | 47371 | 260 |
| Crumley Crossing, IN | 47336 | 765 |
| Dunkirk, IN | 47336 | 765 |
| Fiat, IN | 47326 | 260 |
| Jay City, IN | 47326 | 260 |
| Liber, IN | 47371 | 260 |
| New Mount Pleasant, IN | 47371 | 260 |
| Noble, IN | 47371 | 260 |
| Pennville, IN | 47369 | 260 |
| Poling, IN | 47326 | 260 |
| Portland, IN | 47371 | 260 |
| Powers, IN | 47371 | 260 |
| Redkey, IN | 47373 | 765 |
| Salamonia, IN | 47381 | 260 |
| 47381 | 260 | |
| West Liberty, IN | 47326 | 260 |
| Westchester, IN | 47371 | 260 |