O'Brien is located in Haskell County. About 91 people live here (as of 2020). Between 2010 and 2020, the population declined from 106 to 91. The region is at 480 meters above sea level. The area covers about 1.3 square kilometers. There are about 12 streets in O'Brien. The postal codes are 79539. The dialing code is 940. O'Brien is city in Haskell County, Texas, United States of America.
| Area | 1.3 km² |
| Elevation | 480 m |
| Located in | Haskell County |
| Postal code | 79539 |
| Country | United States |
| Population | 91 |
| Official name | O'Brien |
| Bike path |
| Bike lane on roadway |
| Cycling allowed on bus lane |
| Bicycle street |
| Open to cyclists |
| Open to cyclists, good path |
| Cycling prohibited |
| Cobblestone |
| Long-distance bike route | (depending on scale) |
| Long-distance bike route |
| Long-distance hiking trail | (depending on scale) |
| Long-distance hiking trail |
| Pedestrians prohibited |
Public transit map O'Brien Legend 
Bicycle map O'Brien Legend 
Pedestrian map O'Brien Legend