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ZIP Code boundaries are based on carrier route boundaries, using a combine/dissolve approach. Because there are areas where carrier routes do not exist, ZIP Code boundaries have been extended to provide continuous coverage for the entire United States. In all cases where carrier routes exist, ZIP Codes share a border line with carrier routes.
In some areas, there is insufficient data to create ZIP Code polygons. Where possible, Precisely has created temporary ZIP Code areas and assigned these areas a ZIP Code starting with the three-digit ZIP prefix and a two-letter suffix of either MH or MX (e.g. 901MH). MX is used to indicate an area surrounded by land; MH indicates an area surrounded by water (the H comes from Hydrography).
In rare instances, ZIP Code boundaries may cross state borders. In these cases, the state recorded is the state used in mailing addresses within these ZIPs.
The following ZIP Code types are not included in ZIP Code Boundaries and Centroids:
• Military ZIPs
• Department of Homeland Security (DHS) ZIPs
• US Territory ZIPs (except for Puerto Rico)
• Parcel Return Service ZIPs
ZIP Code Type | Description |
FILLER | ZIP Codes that end in MH or MX are filler ZIPs representing areas where mail is not delivered. |
NON-UNIQUE | This ZIP Code type is assigned to standard ZIP Codes with normal street delivery. |
PO BOX | Represents Post Offices Boxes. |
UNIQUE | This ZIP Code type is associated with a specific company or organization. |
ZIP Code Boundaries Table Structure Seq. | Field Name | Data Type (Length) | Description |
1 | ZIP | CHAR (5) | 5-digit ZIP Code |
2 | NAME | CHAR (40) | Primary postal town name |
3 | ZIPTYPE | CHAR (20) | Type of ZIP Code (see ZIP Code Types) |
4 | STATE | CHAR (2) | State abbreviation. In the rare event a ZIP Code crosses state borders, the state in which the ZIP Code is recorded is the state used in mailing addresses with this ZIP. |
5 | STATEFIPS | CHAR (2) | State FIPS code |
6 | COUNTYFIPS | CHAR (5) | County FIPS code |
7 | COUNTYNAME | CHAR (60) | County name |
8 | S3DZIP | CHAR (3) | 3-digit ZIP prefix |
9 | LAT | FLOAT | Latitude of ZIP centroid |
10 | LON | FLOAT | Longitude of ZIP centroid |
11 | EMPTYCOL | CHAR (5) | Empty record |
12 | TOTRESCNT | INTEGER | Total count of residential deliveries on this route |
13 | MFDU | INTEGER | Total count of multifamily deliveries on this route; generally analogous to apartments |
14 | SFDU | INTEGER | Total count of single-family deliveries on this route; generally analogous to homes |
15 | BOXCNT | INTEGER | Total count of residential PO Box deliveries on this route |
16 | BIZCNT | INTEGER | Total count of business deliveries on this route, including business PO Boxes |
17 | RELVER | CHAR (8) | Release version number |
18 | COLOR | INTEGER | Numeric value for map colorization, so that no two adjacent ZIP Code polygons have the same color. |
19 | WKT | - | MULTIPOYGON label followed by coordinate pairs to define polygon(s). WKT file format only. |
20 | geom | - | Binary internal representation of geometry (MySQL and PostGIS formats only). |
ZIP Code boundaries are based on carrier route boundaries, using a combine/dissolve approach. Because there are areas where carrier routes do not exist, ZIP Code boundaries have been extended to provide continuous coverage for the entire United States. In all cases where carrier routes exist, ZIP Codes share a border line with carrier routes.
In some areas, there is insufficient data to create ZIP Code polygons. Where possible, Precisely has created temporary ZIP Code areas and assigned these areas a ZIP Code starting with the three-digit ZIP prefix and a two-letter suffix of either MH or MX (e.g. 901MH). MX is used to indicate an area surrounded by land; MH indicates an area surrounded by water (the H comes from Hydrography).
In rare instances, ZIP Code boundaries may cross state borders. In these cases, the state recorded is the state used in mailing addresses within these ZIPs.
The following ZIP Code types are not included in ZIP Code Boundaries and Centroids:
• Military ZIPs
• Department of Homeland Security (DHS) ZIPs
• US Territory ZIPs (except for Puerto Rico)
• Parcel Return Service ZIPs
ZIP Code Type | Description |
FILLER | ZIP Codes that end in MH or MX are filler ZIPs representing areas where mail is not delivered. |
NON-UNIQUE | This ZIP Code type is assigned to standard ZIP Codes with normal street delivery. |
PO BOX | Represents Post Offices Boxes. |
UNIQUE | This ZIP Code type is associated with a specific company or organization. |
ZIP Code Boundaries Table Structure Seq. | Field Name | Data Type (Length) | Description |
1 | ZIP | CHAR (5) | 5-digit ZIP Code |
2 | NAME | CHAR (40) | Primary postal town name |
3 | ZIPTYPE | CHAR (20) | Type of ZIP Code (see ZIP Code Types) |
4 | STATE | CHAR (2) | State abbreviation. In the rare event a ZIP Code crosses state borders, the state in which the ZIP Code is recorded is the state used in mailing addresses with this ZIP. |
5 | STATEFIPS | CHAR (2) | State FIPS code |
6 | COUNTYFIPS | CHAR (5) | County FIPS code |
7 | COUNTYNAME | CHAR (60) | County name |
8 | S3DZIP | CHAR (3) | 3-digit ZIP prefix |
9 | LAT | FLOAT | Latitude of ZIP centroid |
10 | LON | FLOAT | Longitude of ZIP centroid |
11 | EMPTYCOL | CHAR (5) | Empty record |
12 | TOTRESCNT | INTEGER | Total count of residential deliveries on this route |
13 | MFDU | INTEGER | Total count of multifamily deliveries on this route; generally analogous to apartments |
14 | SFDU | INTEGER | Total count of single-family deliveries on this route; generally analogous to homes |
15 | BOXCNT | INTEGER | Total count of residential PO Box deliveries on this route |
16 | BIZCNT | INTEGER | Total count of business deliveries on this route, including business PO Boxes |
17 | RELVER | CHAR (8) | Release version number |
18 | COLOR | INTEGER | Numeric value for map colorization, so that no two adjacent ZIP Code polygons have the same color. |
19 | WKT | - | MULTIPOYGON label followed by coordinate pairs to define polygon(s). WKT file format only. |
20 | geom | - | Binary internal representation of geometry (MySQL and PostGIS formats only). |