| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| first zip code in the us | 0.17 | 0.7 | 2741 | 79 |
| first zip code in usa | 1.94 | 0.6 | 2263 | 95 |
| us city with zip code of the first 5 of pi | 1.05 | 0.4 | 4237 | 39 |
| first zip code of each state in the us | 1.03 | 0.3 | 7858 | 77 |
| first frost date by zip code usa | 0.27 | 0.3 | 2845 | 39 |
| what was the first zip code usa | 1.61 | 1 | 8702 | 90 |
| when was the first zip code used | 0.71 | 0.8 | 5793 | 49 |
| us city zip code with first 5 digits of pi | 0.99 | 0.4 | 2352 | 46 |
| what is the first zip code in the us | 0.97 | 0.7 | 5230 | 3 |
| first 3 digits of zip code usa | 0.47 | 0.3 | 3687 | 10 |
| what is the first zip code number | 0.64 | 0.6 | 3261 | 51 |
| where was the first zip code issued | 1.34 | 0.6 | 9130 | 87 |
| zip codes first used year | 0.66 | 0.5 | 5858 | 4 |
| when did zip codes start in usa | 1.53 | 0.8 | 4420 | 59 |
| first digit of a zip code | 0.79 | 0.3 | 2349 | 79 |
| origin zip code usa | 0.63 | 0.5 | 2990 | 38 |
| history of us zip codes | 0.55 | 1 | 1936 | 87 |
| zip code when started | 0.48 | 0.5 | 2076 | 57 |
| when did the zip code begin | 0.97 | 0.1 | 4858 | 97 |
| when did the zip code start | 1.54 | 1 | 9605 | 86 |
| beginning of zip codes | 0.24 | 0.9 | 279 | 53 |
| year zip codes started | 1.81 | 0.6 | 4528 | 1 |
