Oregon Revised Statutes Counties and County Officers § 210.120

The person appointed to the office of county accountant shall qualify within 30 days from the time of the appointment by taking and filing with the clerk of the county an oath to faithfully perform the duties of office, and by executing an official bond, with sureties to be approved by the board of county commissioners, or an irrevocable letter of credit, in either case in the sum of $20,000. The bond or letter of credit shall contain a condition that the principal will faithfully perform the official duties then or which may thereafter be imposed upon or be required of the principal by law, and that at the expiration of the term of office the principal will surrender to any successor all property, books, papers and documents that may come into the possession of the principal. Any bond shall be executed by a lawfully authorized surety company, or by two sureties who shall each justify in the amount required by the bond; and any letter of credit shall be issued by an insured institution, as defined in ORS 706.008. When there are more than two sureties, or more than two letter of credit issuers, they shall justify in an amount which the aggregate shall equal double the amount of the bond or letter of credit. Every surety upon such official bond other than lawfully authorized surety companies must make an affidavit, which shall be indorsed upon the bond, that the surety is a resident and freeholder in the county in which the bond is filed, and worth in property situated in the county, exclusive of encumbrances thereon, double the amount of the undertaking over and above all sums for which the surety is already liable or in any manner bound, whether as principal, indorser or surety, and whether such prior obligation or liability is conditional or absolute, liquidated or unliquidated, due or to become due. All persons offered as sureties on official bonds may be examined on oath as to their qualifications by the officers whose duty it is to approve the bond.