for the individual units or apparatus?
Lincoln County and Newport are L=Lima units, in the 200 and 600 series, Lincoln City are in the 500 series and Toledo at in the 300s.
Specific numbers are generally based on rank as to where are in the series, and availability... BUT not always, some agencies assign a unit number and that's your number regardless of rank.
Fire is probably similar, Lincoln City/NLF will be a series, Depoe Bay/DBF will be a series, same for Newport, Toledo, Siletz, Seal Rock, Central Coast and Yachats. The apparatus will break down also, but I cant help with those. A number sequence will represent an Engine, a Ladder, a Rescue, a Tender etc.