Ill try my best. There are close to 100!!
411/407- City of Brentwood, only 3-digit FD
1100's- Affton
1200's- Crestwood
1300's- Fenton
1400's- Glendale
1500's- Kirkwood
1600's- Lemay
1700's- Mehlville (Largest department in the metro, besides StLFD. And my home department)
1800's- Shrewsbury
1900's- Valley park
2000's- Webster Groves
2100's- Richmond Heights
2200's- Monarch (City of Chesterfield/Clarkson Valley)
2300's- Creve Coeur
2400's- Eureka
2500's- Would be Brentwood FD if they were 4 digit
2600's- University City
2700's- Olivette
2800's- Des Peres
2900's- Frontenac
411/407- City of Brentwood, only 3-digit FD
1100's- Affton
1200's- Crestwood
1300's- Fenton
1400's- Glendale
1500's- Kirkwood
1600's- Lemay
1700's- Mehlville (Largest department in the metro, besides StLFD. And my home department)
1800's- Shrewsbury
1900's- Valley park
2000's- Webster Groves
2100's- Richmond Heights
2200's- Monarch (City of Chesterfield/Clarkson Valley)
2300's- Creve Coeur
2400's- Eureka
2500's- Would be Brentwood FD if they were 4 digit
2600's- University City
2700's- Olivette
2800's- Des Peres
2900's- Frontenac