Zip Source U.S.
Zip Source contains the following geographic codes
cross-referenced by ZIP code:
GSA City Codes. (Base File)
- GSA city codes are city location codes that are
created by the General Services Administration, Office of Finance.
FIPS State and County Codes. (Base File)
- FIPS (Federal Information Processing Standards) state
and county codes are established by the National Bureau of Standards, U.S.
Department of Commerce.
- Zip Source carries multiple identification where
FIPS City Codes. (Base File)
- FIPS city codes are 5-digit identifiers and are
created by the U.S. Department of Commerce. When used in conjunction with a
2-character state code, the FIPS city code uniquely identifies any named
populated place or entity in the nation.
SMSA Codes. (MSA File Option)
- As announced in June 1983, the old Standard
Metropolitan Statistical Areas have been redefined to reflect updated
standards applied to demographic data from the 1980 census. No longer
maintained by the Federal government, the old SMSA codes are carried on Zip
Source records for historical cross-reference purposes.
MSA Codes. (MSA File Option)
These Metropolitan Statistical Areas have been redefined to
reflect updated standards from the 2000 census. The Federal government no longer
maintains them. These codes are carried on the ZipSource file for historical
- The U.S. now recognizes over 250 Metropolitan
Statistical Areas (MSAs) in addition to 23 densely populated Consolidated
MSAs (CMSAs), each of which comprises multiple regions recognized as Primary
MSAs (PMSAs). In addition, Zip Source carries any current exceptions such as
the New England County Metropolitan Areas (NECMAs).
Population Level Codes. (MSA File Option)
Population codes have been discontinued and are no
longer used. These codes are carried on the ZipSource file for historical
- MSAs, NECMAs and PMSAs have been categorized according
to their 1990 population. A one-character population code of A, B, C or D
denotes a population range for the designated statistical area.
MICROPOLITAN STATISTICAL AREA CODE
(MSA FILE Option)
- This field represents a new set of areas. These were
added to the Zipsource file in 2005.According to the Office of Management
and Budget, this field has the following criteria:
It must have a least 1 urban
cluster with a population of at least 10,000 but less than 50,000. It must also
have an adjacent territory that has a high degree of social and economic
integration with the core as measured by commuting ties. This field is defined
in terms of whole counties (or equivalents) including the New England States.
There are 565 Micropolitan Codes.
METROPOLITAN STATISTICAL AREA CODE
(MSA FILE option)
- According to the Office of Management and Budget, this field has
the following criteria:
It must have a least 1 urban cluster
with a population of at least 10,000 but less than 50,000.
It must also have an adjacent territory that has a high degree of social and economic integration with the core as
measured by commuting ties.This field is defined in terms of
whole counties (or equivalents) including the New England States. There are 370
METROPOLITAN DIVISION CODE ( MSA
- This code represents subdivisions of Metropolitan
Statistical Areas. If the Metropolitan Statistical Area contains a single
core with a population of 2.5 million then it can be subdivided. 11
Metropolitan Statistical Areas are broken down into divisions. There are 29
Metropolitan Division Codes.
COMBINED STATISTICAL AREA CODE (MSA FILE option)
- This area comprises two or more metropolitan and or
micropolitan areas. According to the Office of Management and Budget, these
combinations exist for adjacent areas with an employment interchange of 25
or more. If the employment interchange is at least 15 but less then 25, it
is based on the local opinions as expressed by Congressional delegations.
There are 116 Combined Statistical Areas.
Latitude/Longitude Coordinates. (Lat/Long File Option)
- Latitude and longitude are listed to the nearest tenth
of a minute. For most locations on the file, degree and minute values and
directional designations are given from the Equator and the meridian of
Greenwich, England. Sources include the national Atlas and over 1,000 maps
published by the U.S. Postal Service, the U.S. Geological Survey, and
Picadad Arithmetic Distance Coordinates. (Lat/Long File Option)
- Within the continental United States, the latitude and
longitude coordinates have also been converted to simple North and West
picadad arithmetic coordinates (as if the nation were on a flat plane). The
Pythagorean Theorem can be used here to compute the mileage from one ZIP
code or place name to another.
Telephone Area Codes. (Telephone Area Code File Option)
- Three-digit area codes, as originally established by
American Telephone and Telegraph, are included on the file. Up to 3
telephone area codes may appear.
Zip Source contains the following record types:
- The County record contains the standard 5-digit
Federal Information Processing standards (FIPS) county code, county or
parish name, state abbreviation, estimated population, and approximate
number of households within county lines as determined by the 1990 Census.
Post Office City Record.
- The Post Office City Record identifies a city's main
post office, its abbreviation, 5-digit ZIP code and FIPS state and county
codes and GSA code where applicable.
Post Office Branch or Station Record.
- The Post Office Branch or Station record identifies a
branch post office and its parent city, 5-digit ZIP code and FIPS state and
county codes and GSA code where applicable.
Place Name Record.
- The Place Name Record contains the official place name
for a populated area without a post office destination. This record also
includes the place name's General Services Administration (GSA) code,
5-digit ZIP code, state abbreviation, and FIPS state and county codes and
GSA code where applicable.
Unique ZIP Code Record.
- The Unique ZIP Code Record contains all relevant data
for unique ZIP codes, including the post office city name, state
abbreviation, and FIPS state and county codes. A Unique ZIP code is one that
is assigned to a specific university, company, or building.