| Category | Code |
|---|
| Beginner < 3 Minutes | |
| Beginner < 5 Minutes | |
| Beginner < 10 Minutes | |
| Beginner 10+ Minutes | |
| Beginner 750 English Cities | |
| Beginner 1000 English Cities | |
| Beginner 1250 English Cities | |
| Beginner 1500 English Cities | |
| Beginner 1631 English Cities | |
| Beginner 150 Scottish Cities | |
| Beginner 200 Scottish Cities | |
| Beginner 225 Scottish Cities | |
| Beginner 250 Scottish Cities | |
| Beginner 270 Scottish Cities | |
| Beginner 75 Welsh Cities | |
| Beginner 90 Welsh Cities | |
| Beginner 100 Welsh Cities | |
| Beginner 125 Welsh Cities | |
| Beginner 134 Welsh Cities | |
| Beginner 40 Northern Ireland Cities | |
| Beginner 45 Northern Ireland Cities | |
| Beginner 50 Northern Ireland Cities | |
| Beginner 57 Northern Ireland Cities | |
| Beginner 40 Irish Cities | |
| Beginner 50 Irish Cities | |
| Beginner 63 Irish Cities | |
| Beginner 1250 Cities Completed | |
| Beginner 1500 Cities Completed | |
| Beginner 1750 Cities Completed | |
| Beginner 2000 Cities Completed | |
| Beginner 2150 Cities Completed | |
| Beginner 100 Largest Cities | |
| Beginner 250 Largest Cities | |
| Beginner 500 Largest Cities | |
| Beginner 1000 Largest Cities | |
| Intermediate < 5 Minutes | |
| Intermediate < 10 Minutes | |
| Intermediate < 15 Minutes | |
| Intermediate 15+ Minutes | |
| Intermediate 750 English Cities | |
| Intermediate 1000 English Cities | |
| Intermediate 1250 English Cities | |
| Intermediate 1500 English Cities | |
| Intermediate 1631 English Cities | |
| Intermediate 150 Scottish Cities | |
| Intermediate 200 Scottish Cities | |
| Intermediate 225 Scottish Cities | |
| Intermediate 250 Scottish Cities | |
| Intermediate 270 Scottish Cities | |
| Intermediate 75 Welsh Cities | |
| Intermediate 90 Welsh Cities | |
| Intermediate 100 Welsh Cities | |
| Intermediate 125 Welsh Cities | |
| Intermediate 134 Welsh Cities | |
| Intermediate 40 Northern Ireland Cities | |
| Intermediate 45 Northern Ireland Cities | |
| Intermediate 50 Northern Ireland Cities | |
| Intermediate 57 Northern Ireland Cities | |
| Intermediate 40 Irish Cities | |
| Intermediate 50 Irish Cities | |
| Intermediate 63 Irish Cities | |
| Intermediate 1250 Cities Completed | |
| Intermediate 1500 Cities Completed | |
| Intermediate 1750 Cities Completed | |
| Intermediate 2000 Cities Completed | |
| Intermediate 2150 Cities Completed | |
| Intermediate 100 Largest Cities | |
| Intermediate 250 Largest Cities | |
| Intermediate 500 Largest Cities | |
| Intermediate 1000 Largest Cities | |
Airport City Codes (U.S.) 
U.S. Populous Cities (2000) 
Airport City Codes II (U.S)
