Keyword Analysis & Research: when did usa start using zip codes

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when did usa start using zip codes	0.04	0.9	1641	59	34
when	0.29	0.3	4225	84	4
did	1.34	0.9	726	38	3
usa	0.38	0.3	5138	3	3
start	0.32	0.9	5275	89	5
using	0.92	0.3	7264	76	5
zip	0.57	1	2210	77	3
codes	1.91	0.1	2451	42	5

Keyword	CPC	PCC	Volume	Score
when did usa start using zip codes	1.88	0.8	1277	17