Allegheny County Relationship File
This file is a subset of the Pennsylvania relationship file that was retrieved directly from the Census Bureau (pa42trf.txt). This file includes any record where either TRACT00 or TRACT10 in pa42trf.txt was 3, indicating Allegheny County. Tracts are required to follow county lines, however, some of the records had another county specified as TRACT00 with Allegheny County as TRACT10 or vice versa. The 2010 boundary change file for Pennsylvania does not show any boundary changes for Allegheny County. According to Chris Briem, an economist from the University Center for Social and Urban Research (UCSUR), the Census Bureau updated its Pennsylvania geography between the 2000 and 2010 Censuses. The changes in the geography forced adjustments in the tract boundaries, which are reflected in the relationship file. After looking at the 2000 tract and county shape files, he said 2000 tracts line up with 2000 county lines. Likewise, after looking at the 2010 tract and county shape files, he said 2010 tracts line up with 2010 county lines. If working with a 2000 tract (TRACT00) for which the adjustment involved a non-Allegheny County tract, use the POP00 and HU00 values in the same way as with tracts involving only Allegheny County.
Allegheny Census tract boundaries changed significantly after the 2000 Census. Chris Briem said that two factors influenced these changes:
• The City of Pittsburgh and other areas within Allegheny County had experienced dramatic population declines, and many tracts were merged to accommodate the population requirement. This phenomenon may also be seen in other regions of the country.
• The Census Bureau changed how tracts were handled in unpopulated areas. Starting with the 2010 Census, unpopulated areas were divided into tracts separately from populated areas.
Source: Allegheny County 2000/2010 Census Tract Relationships
About this Resource
| Last updated | unknown |
|---|---|
| Created | unknown |
| Name | Allegheny County Relationship File |
| Format | Comma Separated Values File |
| License | License not specified |
| Created | 6 years ago |
| Media type | text/csv |
| has views | False |
| id | 4dcfe307-84fc-4537-b5c3-ea094c69090d |
| metadata modified | 6 years ago |
| package id | 795029d3-1a88-4879-ab25-53881000ccff |
| position | 1 |
| state | active |
| tracking summary | {'total': 0, 'recent': 0} |