Where the lands of a district lie within more than one county, all petitions, papers, documents, or other instruments shall be filed and proceedings had in the county in which the office of the board is established.
Mont. Code Ann. § 85-7-1713
Where documents to be filed and proceedings to be held
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.