San Carlos I
- County:
- Webb County
- County Seat:
- No
- Area (mi²):
- 0.133
- State:
- Texas
San Carlos I is a CDP located in Webb County, Texas. San Carlos I has a 2025 population of 212 . San Carlos I is currently declining at a rate of -3.2% annually and its population has decreased by -31.39% since the most recent census, which recorded a population of 309 in 2020.
The median age in San Carlos I is 45 years: 44.3 years for males, and 46.8 years for females. For every 100 females there are 136.7 males.