Keyword Analysis & Research: when was the zip code invented

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when was the zip code invented	0.81	0.9	4352	31	30
when	1.11	0.4	4895	10	4
was	1.39	0.3	2232	78	3
the	0.62	0.3	7156	95	3
zip	0.63	0.7	3825	41	3
code	0.47	0.8	5764	37	4
invented	0.48	0.5	2680	94	8

Keyword	CPC	PCC	Volume	Score
when was the zip code invented	1.86	0.9	6351	22
when was the first zip code used	0.69	0.2	7070	85
what year was the zip code introduced	0.64	0.4	8115	8
when did zip code start	0.19	0.9	5307	62
when were zip codes introduced	1.15	0.3	3537	73
the history of zip codes	0.81	0.6	5933	34
when did zip codes begin	1.12	0.9	4525	61
how were zip codes created	0.86	0.9	9587	4