United States of America
- Pittsburg, census-designated place in Lawrence County, Alabama
- Pittsburg, a city in the County of Contra Costa, California
- Pittsburg, Williamson County village, Illinois
- Pittsburg, town in Crawford County, Kansas
- Pittsburg, a city in Coos County, New Hampshire
- Pittsburg, city in Pittsburg County, Oklahoma
- Pittsburg, town in Camp County, Texas