Miscellaneous Information

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, chose a 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 number 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 Rock Hall: 2391394

GNIS ID for Kent County: 593907

GNIS ID for Maryland: 1714934

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 Rock Hall:

Place (Community) Code:	67400
State Code:	24 (Maryland)
County Code:	029 (Kent 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:	24/67400
State/County Code:	24/029

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 Maryland:	24		1714934
Kent County:	24/029		593907
Rock Hall:	24/67400		2391394

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 Rock Hall, it is a point within Rock Hall 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 Rock Hall, the GNIS GPS location is given as:

Lat:   39° 8' 20"   (or 39.14°)

Lon:   -76° 14' 35"   (or -76.24°)  

Determined by its statistical needs, the Census Bureau has defined a sampling area for Rock Hall - 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 Rock Hall, the Census 2010 GPS location is given as:

Lat:   39° 8' 17"   (or 39.14°)

Lon:   -76° 14' 28"   (or -76.24°)  

The map point defined by the Census Bureau lies 690 feet to the southeast<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:   39° 8' 11"   (or 39.14°)

Lon:   -76° 14' 30"   (or -76.24°)  

The GPS location given for the 2000 Census lies 582 feet to the south<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. Rock Hall is located in Region #3 (the South Region).

In turn, the US Census Bureau has further divided each Region into Divisions. Rock Hall is located in Division #5 (the South Atlantic Division).

The Office of Management and Budget (OMB) has created ten Federal Regions. Rock Hall is located in Region III (Region 3).

The Federal Emergency Management Agency (FEMA) has created ten Management Regions. Rock Hall is located in Region III (Region 3).

ZIP Codes ...

While some people have used a ZIP code to identify a community, the purpose of the ZIP code was to make mail delivery more efficient by grouping addresses together. Although the ZIP Code doesn't specifically identify a town like Rock Hall, it does identify addresses that are in (or near) Rock Hall. It's important to remember that the boundaries of a ZIP Code are defined by the needs of the USPS and can be changed, re-assigned or overlapped with other ZIP Codes.

The ZIP code for Rock Hall: 21661<3>

Referenced GNIS Records ...

GNIS ID #586872   (Name of Record: Rock Hall)

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: Kent

Map Name: Rock Hall

Lat: 39.1381658       Lon: -76.2349537  

Elev: 3 ft.

GNIS ID #2391394   (Name of Record: Town of Rock Hall)

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: Kent

Map Name: Rock Hall

Lat: 39.1391469       Lon: -76.243201  

Elev: 3 ft.

Referenced FIPS Records ...

FIPS Code: 24/67400   (Place Name: Rock Hall)

County: Kent     (FIPS State/County: 24/029)

Class: C1

Identifies an incorporated place (ie- Rock Hall) that does not serve as a primary county division - or in other words, it is included in and is part of a primary county division (ie- Kent County).

GSA Code: 1350

MRF Code: 845

Off-the-Road Links ...

The official website for Rock Hall: www.rockhallmd.com/

The official website for Kent County: www.kentcounty.com/

The official website for State of Maryland: https://www.maryland.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)