The following counties satisfy your query:
| County | Population | County Seat | State | Links |
| Fairfield County, CT | 882567 | Bridgeport | Connecticut | View Public Records for Fairfield County, CT |
| Fairfield County, OH | 122759 | Lancaster | Ohio | View Public Records for Fairfield County, OH |
| Fairfield County, SC | 23454 | Winnsboro | South Carolina | View Public Records for Fairfield County, SC |