| Time Zone | Time Zone designation within the U.S. - numbers 4-11 are assigned as follows:
| Code | Description |
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| 4 | Atlantic | | 5 | Eastern | | 6 | Central | | 7 | Mountain | | 8 | Pacific | | 9 | Alaska | | 10 | Hawaii-Aleutian Islands | | 11 | Samoa |
Note: The time zone selections come from the Time Zone code table.
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| Daylight Savings Time | Indicates whether a zip code is on daylight savings. |
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| County | The county or parish of the ZIP Code. This field maps to the County master list. |
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| City Type | Describes the type of station in the City Alias Name field:
| Code | Description |
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| A | Airport Mail Facility (AMF) | | B | Branch | | C | Community Post Office (CPO) | | D | Area Distribution Center (ASC) | | E | Sectional Center Facility (SCF) | | F | Delivery Distribution Center (DDC) | | G | General Mailing Facility (GMF) | | K | Bulk Mail Center (BMC) | | M | Money Order Unit | | N | Non Postal Community Name | | P | Post Office | | S | Station | | U | Urbanization |
Note: These city type selections come from the City Type code table.
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| County FIPS | Federal Information Processing Standards code given to counties or parishes. |
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| State FIPS | Federal Information Processing Standards code given to each state or US territory. |
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| City Alias Name | Alias name for the ZIP Code. This may be a city name, postal entity, community, or a municipality name. |
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| City Alias Abbreviation | Abbreviation of city alias where applicable. |
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