Geocorr 1990: Geographic Correspondence Engine

Version 3.03a With 1990 Census Geography

This application accesses the MABLE98 geographic database (rev. 7/10) with 1980 and 1990 geographic codes to generate custom correlation lists as reports and/or files. Click on the help icons (help) for detailed info on any section of this form. Only the first two sections of this form are required. Please note that processing time may be several minutes for large areas or multiple states.

Help | Examples | Usage Notes | Geographic codes lookup | Other Geocorr versions

Input Options

(ctl-click to select multiple)

* The 1995 MSA and PMSA codes are not available in New England. NECMA95 codes are available only for New England.

** If you chose "Concentric Ring Pseudo-Geocode" from either list, you must specify either Point and Distance or Ring Geocode options below.

*** Hydrologic Unit Codes are normally eight digits, but you can specify keeping only the first two, four, or six (region, subregion, and accounting units). These codes not available for Alaska and Hawaii.

2 4 6 8

See the geographic glossary for descriptions of the source and target geocodes used here.

Population (1990 census)

Land area (square km)

Housing units (1990 census)

Output Options

Use tabs as delimiter

Include both geographic codes and names (where applicable)

Include only codes (no names)

Include only names (no codes)

Include both geographic codes and names (where applicable)

Include only codes (no names)

Include only names (no codes)

Point and Distance Options

Use these options to define one or more rings around a central point to be used as geographic filter(s).

° N latitude

° W longitude

Use Google Maps to get latitude/longitude coordinates. Or, see CAPS usage notes for links to alternative web sites where you can enter an address and get coordinates.

miles or kilometers

Number of equidistant concentric rings:

Or, specify custom ring radii in ascending order. The largest radius should equal the largest ring radius as specified above:

A ring will identified on output files by its outer radius. E.g., a ring of 4 to 8 miles will have code "8".

Bounding Box Filter Options

To limit processing to blocks with center points that fall in a specified rectangular area, enter the coordinates for the bounding box here.

Northernmost latitude: ° N

Southernmost latitude: ° N

Westernmost longitude: ° W

Easternmost longitude: ° W

Geographic Filtering Options

Use these options to limit the geographic universe to any or all of three types of geography, using FIPS codes. If you need to look up the codes, follow the links to the code-list files in each section, or use the geographic codes lookup web app.

AND (intersection)

OR (union)

Enter five-digit FIPS county codes with leading zeroes separated by blanks. You may enter three-digit codes if you selected only one state, above.

Enter four-digit MSA, CMSA, or PMSA codes with leading zeroes separated by blanks.

Enter seven-digit FIPS place codes with leading zeroes separated by blanks. You may enter five-digit codes if you selected only one state, above.