Table A3-9 Standard Mail ZIP Code Usage by Shape (Percentage of Pieces Received by Households) Postal Fiscal Years 1987, 2006 and 2007 (Diary Data)
Zip Code Mailing Address	Letter Size Envelope			Larger Than Letter Size Envelope			Detached Label			Postcard
	1987	2006	2007	1987	2006	2007	1987	2006	2007	1987	2006	2007
5-digits	95.4	6.7	7.2	94.9	4.9	6.0	98.7	72.6	70.5	96.0	10.5	8.7
Zip+4	2.3	89.2	89.6	2.6	91.6	91.7	0.6	23.7	26.1	2.0	87.7	89.2
ZIP not included	0.2	0.3	0.3	0.5	0.2	0.4	0.5	3.5	3.3	1.5	1.5	1.9
Don't know/No answer	2.0	3.9	2.9	1.9	3.3	2.0	0.2	0.3	0.1	0.5	0.3	0.1
Total Mail Received by Households	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Zip Code Mailing Address	Catalog Not in Envelope			Flyers			Newspapers/ Magazines			Total
	1987	2006	2007	1987	2006	2007	1987	2006	2007	1987	2006	2007
5-digits	95.2	2.1	1.7	86.8	11.3	14.3	80.6	12.8	10.8	92.5	10.7	10.0
Zip+4	2.9	97.2	97.6	2.0	85.6	83.1	1.3	74.7	75.5	2.2	85.7	87.0
ZIP not included	1.4	0.4	0.2	9.7	2.8	2.3	12.1	11.6	12.9	3.5	1.7	1.7
Don't know/No answer	0.5	0.3	0.4	1.5	0.3	0.4	6.0	0.9	0.7	1.7	1.8	1.4
Total Mail Received by Households	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Note: Totals may not sum to 100 due to rounding.