| Category | Contains the number of abbreviations |
|---|---|
| Aircraft & Aviation | 2273 |
| Animals | 969 |
| Awards & Medals | 1193 |
| Chess | 290 |
| Clothes | 713 |
| Coins | 244 |
| Colors | 428 |
| Commissions | 381 |
| Construction | 1616 |
| Days Abbreviations | 250 |
| Dogs Related | 603 |
| Farming & Agriculture | 2280 |
| Food | 2228 |
| Food & Nutrition | 880 |
| Food Additives | 535 |
| Foundations | 2625 |
| Funnies | 9447 |
| Hobbies | 1632 |
| Journals | 3095 |
| Manufacturing | 1516 |
| Months Abbreviations | 85 |
| Names and Nicknames | 1780 |
| NFL Teams | 151 |
| Photography | 326 |
| Photography & Imaging | 372 |
| Plastics | 482 |
| Poker | 115 |
| Quilting | 121 |
| Salutations | 11 |
| Science Fiction | 1461 |
| Ship Types | 460 |
| Shipping & Sailing | 230 |
| Slang | 21 |
| Toastmasters | 360 |
| Unclassified | 288842 |
| Unit Measures | 1419 |
| USPS | 696 |
| Working Groups | 356 |
| ZIP Codes | 6 |