With the exception of certain types of records, most requests for public records can be submitted via Missoula County's online records request portal. 

Popular resources that might help you find what you're looking for without needing to submit a records request:

• Commissioners’ agenda portal (for upcoming public meetings)
• Missoula County budgets (includes full budgets from 2003 to present and additional resources) 
• Official Missoula County records (scanned plats, documents)
• Commissioners' Journals (official records of commissioner action from 1865 on)
• Property Information System (permitting information, voting precincts, etc)
• iTax information system (taxing information for any property in the county)