# ZIP+4 codes

A poll mostly for those who live in the United States:

Edit to clarify: "do you use it" means "do you write the ZIP+4 code on the envelope" rather than "do you use any form of ZIP code". (I take it for granted that most people write at least the basic ZIP code.)

Poll #577139 ZIP 4

Mark all that apply:

I live in the United States of America
0(0.0%)
I know what a ZIP code is
2(4.4%)
I know what a ZIP+4 code is
0(0.0%)
I know the ZIP code for my current residence
0(0.0%)
I know the ZIP+4 code for my current residence
0(0.0%)
I know the ZIP code for my home (if different from current residence -- e.g. if you're at university)
0(0.0%)
I know the ZIP+4 code for my home
0(0.0%)
I don't know the ZIP+4 code for my current residence, but I know where I could find it out
0(0.0%)

When you send someone mail and that person/company/whatever lists a ZIP 4 code in their address, do you use it when you address the envelope? (0 = never, 100 = always)

Mean: 65.12 Median: 90 Std. Dev 37.75
0
6(14.6%)
10
3(7.3%)
20
0(0.0%)
30
1(2.4%)
40
1(2.4%)
50
4(9.8%)
60
1(2.4%)
70
3(7.3%)
80
1(2.4%)
90
8(19.5%)
100
13(31.7%)

When you send someone mail and that person/company/whatever doesn't list a ZIP 4 code in their address, do you find out the ZIP 4 code and use it when you address the envelope? (0 = never, 100 = always)

Mean: 7.21 Median: 0 Std. Dev 18.47
0
33(76.7%)
10
6(14.0%)
20
0(0.0%)
30
0(0.0%)
40
0(0.0%)
50
2(4.7%)
60
0(0.0%)
70
1(2.3%)
80
1(2.3%)
90
0(0.0%)
100
0(0.0%)

I'm curious, because I tend to try to find out ZIP+4 codes when I write to people in the States, perhaps for geek value; however, I've found it extremely rare for people to quote ZIP+4 codes in their addresses.

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