1990 SUMMARY TAPE FILE 3B ZIP CODES/BLOCK EQUIVALENCY

$2,300 for entire file (discounted from $2,880) 2304 MB See price list below for individual file Technical documentation included with purchased - $15 if purchased separately Order from Customer Services, Bureau of the Census, Washington, DC 20233 (Tel. 301-763-INFO(4636); FAX 301-457-3842) D.D. XVI-33

Contents: This Equivalency file contains the 300 characters in the identification section of the data dictionary used in all 1990 STF's. It equates 1990 census block numbers with the areas that approximate October 1991 ZIP Codes used by the USPS to deliver mail. The File provides a 5-digit ZIP Code for each land block number within each State with a few exceptions.

It is important for the data user to understand the limitations of this product, since different applications require different levels of boundary and data accuracy. Census geography and United States Postal Service (USPS) geography cannot be linked easily. In practice, Zone Improvement Plan (ZIP) Codes are more accurately represented as an open network of lines interspersed with points. Any attempt to create ZIP Codes areas requires interpretation and adjustment.

The ZIP Code delineations in this file are the product of Geographic Data Technology of Lyme, New Hampshire and represent this commercial vendor's interpretation of the relationship of ZIP Codes to 1990 census block numbers. The particular model and methodology used to create this file are one of many possible approaches. There are no "Post Office Box Only" ZIP Codes included in this file.

ZIP Codes in this file and the TIGER/LineTM files were derived by different methodologies and are represented differently in their respective products. ZIP Codes in this file are not derived from, nor will they be incorporated into, the TIGER/Line data base or any of its extract files. The data user must not assume that the ZIP Codes are consistent between these two products.

File Set 1. ZIP Codes beginning with 0, 1 or 2: $625.

Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, Vermont (ZIP 0)

Delaware, New York, Pennsylvania (ZIP 1)

Dist. of Columbia, Maryland, North Carolina, South Carolina, Virginia, West Virginia (ZIP 2)

File Set 2: ZIP Codes beginning with 3 or 4: $650.

Alabama, Florida, Georgia, Mississippi, Tennessee (ZIP 3)

Indiana, Kentucky, Michigan, Ohio (ZIP 4)

File Set 3: ZIP Codes beginning with 5, 6 or 7: $1,175.

Iowa, Minnesota, Montana, North Dakota, South Dakota, Wisconsin (ZIP 5)

Illinois, Kansas, Missouri, Nebraska (ZIP 6)

Arkansas, Louisiana, Oklahoma, Texas (ZIP 7)

File Set 4: ZIP Codes beginning with 8 or 9: $425.

Arizona, Colorado, Idaho, Nevada (part), New Mexico, Wyoming, Utah (ZIP 8)

Alaska, California, Hawaii, Oregon, Nevada (part), Washington (ZIP 9)