| Official Zip Code Name | Old Greenwich |
| Zip Code State | Connecticut |
| Primary County: | Fairfield |
| Area Code | 203/475 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 5 |
| Elevation Range | 34 ft. |
| Area | 2.267 Sqm. |
| Coordinates(Y,X) | 41.033174, -73.570009 |