| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Irchester | city | Northamptonshire | United Kingdom | 52.28 | -0.65 | 239 | 38915 |
| Irthlingborough | city | Northamptonshire | United Kingdom | 52.32 | -0.60 | 239 | 38545 |
| Isham | city | Northamptonshire | United Kingdom | 52.35 | -0.70 | 229 | 48691 |
| Islip | city | Northamptonshire | United Kingdom | 52.38 | -0.53 | 196 | 7913 |