I'm going to name the things you haven't done for us when our members were on strike at the rail. The department is responsible for maintaining the filed records for each Probate Court case.The clerk also attends each court docket in support of the court. Application Assistance Information. If you have received a jury summons you must pre-register below. The Harris County Voter Registration Department serves over 2.5 million registered voters in the nation's third largest county. In Harris County, you can register to vote if you: - Are a resident of Harris County;. The department is responsible for maintaining the filed records for each Probate Court case. The clerk also attends each court docket in support of the court. If you have received a jury summons you must pre-register below.