Wash. Rev. Code » Title 4 · Chapter 4.28
Revised Code of Washington

Wash. Rev. Code § 4.28.140 (2026)

Affidavit as to unknown heirs

✓ current as of May 2026
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Upon presenting an affidavit to the court or judge, showing to his or her satisfaction that the heirs of such deceased person are proper parties to the action, and that their names and residences cannot with use of reasonable diligence be ascertained, such court or judge may grant an order that service of the summons in such action be made on such "Unknown heirs" by publication thereof in the same manner as in actions against nonresident defendants.
[ 2011 c 336 s 99; 1903 c 144 s 2; RRS s 230.]

Notes:

Rules of court: Cf. CR 10(a).
Notes of Decisions
Cited in 2 cases (1 in the last 5 years), 1989–2024 · leading case: Brenner v. Port of Bellingham, 765 P.2d 1333 (Wash. Ct. App. 1989).
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Brenner v. Port of Bellingham, 765 P.2d 1333 (Wash. Ct. App. 1989). · cites it 5× “She contended that the Port failed to comply with RCW 4.28.140 in obtaining service by publication.”
United Fin. Cas. Co. v. Rapid Age Grp. LLC (W.D. Wash. 2024). · cites it 2× “12 Wash. Rev. Code § 4.28.140 . Arizona authorizes service by publication only if: 13 (A) the last-known address of the person to be served is outside Arizona but: 14 (i) the serving party, despite reasonably diligent efforts, has not been able 15 to ascertain the person’s…”
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