Port Arthur
- County:
- Jefferson County
- County Seat:
- No
- Area (mi²):
- 75.551
- State:
- Texas
Port Arthur is a city located in Jefferson County, Texas. Port Arthur has a 2026 population of 55,799. Port Arthur is currently growing at a rate of 0.01% annually but its population has decreased by -0.38% since the most recent census, which recorded a population of 56,011 in 2020.