| CM | Commercial |
| EN | End |
| FD | Fire District |
| IAT | In Adjacent Town |
| IAN | Indoors completely above ground not on a masonry floor |
| IAM | Indoors completely above ground on a masonry floor |
| ID | Industrial |
| IN | Inside City Limits |
| INF | Inside City Limits, fringe |
| INN | Inside City Limits, non-fringe |
| IS | Isolated |
| MI | Middle |
| NO | None |
| N | Not in Graded Fire District |
| OFA | Off Airport |
| ONA | On Airport |
| OT | Other |
| OAG | Outdoors completely above ground |
| OUT | Outside City Limits |
| OCF | Outside City Limits, fringe |
| RE | Residential |
| Rural | Rural Area (as opposed to City or Suburban) |
| B | Rural Protected |
| T | Semi-Protected |
| SU | Suburban |
| UG | Underground |
| UI | Unincorporated |
| V | Unprotected |