The town was given the name of Hillsborough, which in 1858 was modified to Hillsboro. A building fund, provided for by tax assessments in 1852, was used to construct permanent county headquarters in Washington County. A frame courthouse was built in 1852. Rolls show property owner's name, township name, block and lot numbers, range number, acres, land value, improvement value, personal property value, tax, and totals. Tax breakdown includes poll, school, territorial, and county categories and may include delinquent taxes owed, a listing of lots sold, and signatures of sheriff, auditor, and assessor.
Series is arranged chronologically by tax year.
Censuses show family surname, number of adult males and females, number of male and female children per family, and totals. Series is arranged chronologically by census year. Services include jury duty, guarding of prisoners, printing, preparing documents, and assessing property values. Series is arranged chronologically by claim date. Records include inquest transcripts, jury verdicts, coroner's expense statements, summons, and subpoenas.