This is a partial list from several sources of Chicago Fire Department unit designators. Any corrections or additions....please add them 

2-1-3 Callsign of the Fire Commissioner 
2-1-4 thru 2-1-19 Deputy Commissioners (Permanent #) 
2-2-1 thru 2-2-6 Deputy District Chiefs (Dist 1-6 24/48 schedule) 
2-2-7 Deputy District Chief at O'Hare Airport (24/48 schedule) 
2-7-1 thru 2-7-4 Communications units (working fires etc..) 
2-7-8 Communications unit at O'Hare Airport 
2-8-6 Training Academy Engine 
2-8-7 Training Academy Truck 
2-8-8 Training Academy Ambulance 
3-4-6 Support & Logistics 
4-2-8 Radio shop 
4-2-10 Vehicle trackers 
4-2-12 Big communications van (bus) 
4-5-1 thru 4-5-8 E.M.S. District Supervisors (Dist 1-8 24/48 schedule) 
4-6-4 O.F.I. (arson unit) 
4-9-2 Photo unit 
4-9-7C Public Education unit 
5-1-1 Haz-Mat unit (with E-22) 
5-2-1 Collapse unit (with E-5)
5-5-1 is the telegraph signal for Squad 1
5-5-2 is Squad 2
5-5-5 is Squad 5
5-5-7 is Squad 7
6-4-3 & 6-4-4 Mask units 
6-7-1 Large water turret unit=20 
6-8-7 Diver unit (Meig's Field) 
6-3-6 Crash unit at Meig's 
6-5-10 Big crash unit at Meig's 
6-3-4, 6-3-7, 6-5-2, 6-5-9 Crash units at Midway Airport 
6-5-3, 6-5-4, 6-5-5, 6-5-6, 6-5-7 & 6-5-8 Crash units at O'Hare Airport
6-3-5 Aircraft stairway 
7-5-1N & 7-5-1S Delivery units 
7-4-7 Vehicle Repair 
7-3-3 Vehicle Repair 
7-5-3 Tow Truck 
8-8-3 Mass Casualty unit (bus) 
9-1-1 Big light unit 

** E-37 is the fire boat docked at the water filtration plant by Navy Pier - correction - E37 has been replaced by the overhauled E58 - E37 is either spare or spare parts now - both boats were built in 1947 from a 1937 design

Ambulances 80-91 are B.L.S. only (manned by E.M.T.'s) 

from the [email protected] list on 26Oct00

IL

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