I know this is an old thread, but here's some helpful info on the South Cities channel. Shonc182 was saying he wasn't sure who was who meaning which city was talking. Here is a basic outline of each city's call signs.
Tigard - Starts with the number 2; their calls signs are four digits, example - 2122
Tualatin - Starts with the number 9; their call signs are also four digits, example - 9422
Sherwood - Starts with the number 7; call signs are four digits, example - 7224
King City - Starts with the number 3; call signs are four digits, example 3319
The second number is which shift they work for; days (1), swing (2), nights (3), midnights (4)
The third number is usually the district they are assigned.
The fourth number is usually an internal designation for which side of the shift week they work.
WCSO uses the number 5 designation, Beaverton 6, Hillsboro 1.