On the fire side the only signals I ever hear are signals 6x (drunk) and 9 (crash). On the police side I've heard a few signal 34s.
But I imagine this list for FFX PD is the same for all.
1 Contact--By Phone
1A Give Me Your Phone No.
1I Contact--By Phone At Once
2 Contact--By Teletype
3 Report To ---
3I Report To --- Immediately
4 Meet Complainant For Full Report
6D Driving Drunk In Auto
6P Drunk Pedestrain
6X Drunk
7 Larceny
7S Larceny, Shoplifter
9 Property Damage Accident
9I Personal Injury Accident
9F Fatal Accident
10 Ambulance Run
10F Fatal, Dead On Arrival
11 Hit & Run, Property Damage
11I Hit & Run, Personal Injury
11F Hit & Run, Fatal Injuries
12 Jail Break
13 Police Officer In Trouble
13I Police Station Trouble
15 Unlawful Assembly
15F Fight In Progress
15R Riot
16 Leaving My Area To ---
17 Road Check At ---
18 House Check At ---
19 Radar Set-Up At ---
20 Traffic Complaint
21 Trespassing
22 Abandon Auto
23 Alarm Sounding
24 Animal Case
24D Dog Bit
25 Assault
26 Assault
27 Bad Check
27 Breaking & Entering
27S Breaking & Entering, Safe Job
27I Breaking & Entering In Progress
28 Escort
29 Family Trouble
30 Fire Alarm
30A Fire Alarm -- Auto
31 Firearm Violation
32 Juvenile Case
34 Mental Case
35 Missing Person Or Runaway
36 Murder
37 Open Window Or Door
38 Lost/Found Property
39 Prowler
40 Robbery
40I Robbery In Progress
41 Service
42 Sex Offense Other Than Rape
42R Rape
43 Stake-Out
44 Stolen Auto
44R Stolen Auto Recovered
45 Suicide
45A Suicide Attempt
46A Suspicious Auto
46P Suspicious Person
46W Suspicious Person W/Weapon
47 Vandalism
48 Warrant
49 Bomb Threat
50 Loud Party
51 Phone Threat
52 No Units Available
53 Miscellaneous
54 Disorderliness
55 (unknown)