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Various Identification Codes ...

GNIS Codes ...

The U.S. Board on Geographic Names (BGN) was created to address the problems caused by spelling and naming variations. The BGN will usually recognize an existing name or, when necessary, establish a new name for a geographic feature (such as a mountain, lake, river, stream, city, town, village, dam, bridge, etc).

The BGN names are kept in a database called the Geographic Names Information System (GNIS) and it is the official Federal repository. The GNIS is operated and maintained by the U.S. Geological Survey (USGS).

A unique and permanent numeric code has been assigned for each name in the GNIS database. These names and identifiers are definitive and it is intended that they are to be used by all departments of the Federal Government:

GNIS ID for Troy: 979559

GNIS ID for Rensselaer County: 974140

GNIS ID for New York: 1779796

FIPS Codes ...

In a past effort, various federal agencies created a set of codes with a purpose similar to the GNIS codes. These codes are called the Federal Information Processing Standard (or the FIPS 55 codes). Although they are still used by some organizations, the FIPS codes are obsolete and will ultimately be replaced by the GNIS codes.

The following FIPS codes apply to Troy:

Place (Community) Code:  75484
State Code:  36 (New York)
County Code:  083 (Rensselaer County)

Since the Place and County FIPS codes are not unique and can be repeated in other States, it's necessary to combine the State code with the Place and County FIPS codes to uniquely identify them - for example:

State/Place Code:  36/75484
State/County Code:  36/083

As already mentioned, the FIPS codes are to be replaced by the GNIS codes. The following reflect those changes:

 FIPS Code
translates to    
GNIS Code
State of New York:    36   1779796
Rensselaer County:    36/083   974140
Troy:    36/75484   979559

GPS Location - GNIS vs Census ...

An important aspect of the GNIS code is that it assigns a GPS location (the latitude/longitude) to the geographic feature. This location is simply a point on the map and does not represent the size or shape of the feature. In the case of Troy, it is a point within Troy that might be a post office, the city hall or simply an intersection - the point should really be considered arbitrary and only indicating a general location.

For Troy, the GNIS GPS location is given as:

Lat:   42° 44' 4"   (or 42.73°)

Lon:   -73° 40' 30"   (or -73.68°)   [Map]

Determined by its statistical needs, the Census Bureau has defined a sampling area for Troy - this area also contains a map point. As with the GNIS code, the location of the Census point should be considered as being arbitrary within the sampling area.

For Troy, the Census 2010 GPS location is given as:

Lat:   42° 44' 8"   (or 42.74°)

Lon:   -73° 40' 31"   (or -73.68°)   [Map]

The map point defined by the Census Bureau lies 473.1 feet to the north<1> of the point given by the GNIS (see above).

You might note that the GPS location given for the 2010 Census is different than the location that was specified by the 2000 Census:

Lat:   42° 44' 17"   (or 42.74°)

Lon:   -73° 40' 50"   (or -73.68°)   [Map]

The GPS location given for the 2000 Census lies 1,722 feet to the northwest<2> of the point given by the 2010 Census.

Regional Codes ...

For statistical purposes, the US Census Bureau has divided the country into four Regions. Troy is located in Region #1 (the Northeast Region).

In turn, the US Census Bureau has further divided each Region into Divisions. Troy is located in Division #2 (the Middle Atlantic Division).

The Office of Management and Budget (OMB) has created ten Federal Regions. Troy is located in Region II (Region 2).

The Federal Emergency Management Agency (FEMA) has created ten Management Regions. Troy is located in Region II (Region 2).

Referenced GNIS Records ...

GNIS ID #967902   (Name of Record: Troy)

Class: populated place

A place or area having clustered or scattered buildings and a permanent population (such as a city, settlement, town or village). The boundaries may or may not coincide with the perceived population.

A 'populated place' record may have a corresponding 'census' or 'civil' record. The information contained in the 'populated place' record applies only to the class and should not be confused with either the 'census' and 'civil' classes.

County: Rensselaer

Map Name: Troy South

Lat: 42.7284117       Lon: -73.6917851   [Map]

Elev: 10 ft.


GNIS ID #979559   (Name of Record: City of Troy)

Class: civil

A political division formed for administrative purposes (such as a borough, county, incorporated place, parish, town or township).

A 'civil' record may have a corresponding 'census' or 'populated place' record. The information contained in the 'civil' record applies only to the class and should not be confused with either the 'census' and 'populated place' classes.

County: Rensselaer

Map Name: Troy South

Lat: 42.7345227       Lon: -73.6751181   [Map]

Elev: 82 ft.

Referenced FIPS Records ...

FIPS Code: 36/75484   (Place Name: Troy)

County: Rensselaer     (FIPS State/County: 36/083)

Class: C5

GSA Code: 6110

MRF Code: 3625

MSA Code: 160

The official website for Troy: www.troyny.gov/

The official website for Rensselaer County: www.rensco.com/

The official website for State of New York: https://www.ny.gov/


The official website of the U.S. Board on Geographic Names (BGN)

The official website of the U.S. Geological Survey (USGS)

The official website of the U.S. Census Bureau

The official website of the U.S. Office of Management and Budget (OMB)

The official website of the U.S. Federal Emergency Management Agency (FEMA)

Footnotes ...

<1>The calculated bearing (or angle) to the GNIS-supplied location is 6 degrees and a distance of 473.1 feet.
<2>The calculated bearing (or angle) to the 2000 Census location is 58 degrees and a distance of 1,722 feet.




 

 

 

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This page was last modified/updated: 25 Jan 2023