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NPANXX Detailed Specifications

Detail of Data

Please note: Not every record will have all fields populated.

NOTE: Due to the Number Portability Act and other factors, not all zip codes will be represented in the area code database.

Field Name Description
State Two letter USPS state abbreviation
NPANXX Combined Area Code and local number prefix (six digits)
NPA Area Code (NPA = Numbering Plan Area)
New NPA New Area Code. During the permissive dialling period, the old area code map still be displayed in the "NPA" field. If blank, then there is no record (yet?) of a split. If non-blank, then associated NXX is freshly relocated to this new NPA and the NPA in the "NPA" field (above) would be the old one
NXX Three digit local number prefix (X=2-9, X=0-9). Generally 201 thru 999.
Status Indicates if this NPANXX is in active use ("Active" or "Inactive")
Latitude Latitude of record for the central office
Longitude Longitude of record for the central office
WeightLat Latitude for the centroid of the ZIP Code that has the highest frequency of occurrence within the NPANXX
WeightLon Longitude for the centroid of the ZIP Code that has the highest frequency of occurrence within the NPANXX
LATA Local Access Transport Area
City Name Popular or political name of city
Time Zone Offset from GMT (5=East, 6=Central, 7=Mountain, 8=West, etc..)
County Name of county this record resides in.
County Population The population of the county from the 2010 Census.
ZIP Code ZIP Code (United States) (five digits)
ZIP Code Population

Approximate population of the ZIP code.

Zip Code Freq.

Percent frequency of occurrence of this Zip Code in the NPANXX area.

If = 0, then unknown
If = -1, then the ZIP Code is the most frequent, but % unknown
If = -2, then the ZIP Code is the second most frequent, but % unknown

NXX Type Primary use designation. L=Landline, W=Wireless (all wireless; pagers, cellular, PCS, etc.)
Note that some NXXs may be subdivided between landline and wireless. This is simply the reported type.
NXX Intro Version of this product that NXX first appeared. This is not necessarily the NXX service date, but it should be within 12 months. exception: Since 1994-02-04 was the first version that included the intro date, then all older NXXs will have an intro date of 1994-02-04 regardless of actual service date.
Overlay 1 = NPA recent overlay, blank = Not an overlay
Rate Center Ten character Rate Center name for CO. Blank = Rate Center name unknown.
MSA_CBSA Census Bureau Names for the metro area of the central office.
MSA_CBSA_CODE Census Bureau ID numbers for the metro area of the central office.
FIPS Census Bureau FIPS code (ID) for the tract of the central office
Observes DST 1 = Observes DST (Daylight Saving Time) during the normal DST observance period, 0 = Does not observe DST at all. Some areas of the country such as AZ (except for the Navajo Nation), HI, GU, PR, VI, and parts of IN do not observe DST.
OCN Four-character alphanumeric field identifying the NPA-NXX code-holder and/or service provider.
Phone Company The name of the phone company the NPA/NXX is registered to.
CoverageAreaName The name of the area this NPA-NXX Covers. This is primarily the city name
but other Alias Names may be used.

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