I think the only department in South King County that maybe using a three number apparatus designator is the Port of Seattle as they are,
Command 700 (On Duty Operations Chief)
711 & 712 (Structual Fire Apparatus)
731 & 732 (Aid Cars)
733, 734, 735 & 736 (Airport Crash Trucks)
777 (Hazardous Materials Unit)
787 (Mass Casualty Incident Response Unit)
You may hear these numbers on a South King talk group espesically with the City of SeaTac units (45, 46, & 47) as the Port of Seattle goes mutual aid with them.
If you hear 711 it may also be a backup rig to Kent Fire station 71 as the South King departments will add a "1" to the end of there designators when using a back up apparatus.
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