| Official Zip Code Name | Markham |
| Zip Code State | Texas |
| Primary County: | Matagorda |
| Area Code | 979 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 49 ft. |
| Area | 39.566 Sqm. |
| Coordinates(Y,X) | 28.970348, -96.103860 |