Hello,
I am using the block group crosswalks to compare ACS 5yr estimates from 2013-2023. I am using the crosswalk files for 2010 Block Groups → 2020 Block Groups.
In the file for Connecticut, the geographies listed are for the areas used pre-2022 (changes listed at Changes to Counties and County Equivalent Entities: 1970-Present on the 2020 tab) and include FIP codes like 09001?. Do you have a file relating the 2010 Block groups for Connecticut to the new county-equivalent geographic unit/planning regions adopted in 2022? Or do you have a mapping between the old counties’ block groups to the new planning regions’ block groups?
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To address this issue, we hope to extend our crosswalks to 2022 at some point in the next year or two, but for now, we have some documentation about this problem in this section of the Crosswalks page. There, we recommend using the Geocorr 2022 website, where you can get a correspondence file between 2020 block groups and 2022 Connecticut counties (a.k.a. “planning regions”). You could then use that file to generate IDs for 2022 (and later) block groups.
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We have now extended our crosswalks to address changes that occur in non-census years, including the new Connecticut county equivalents. You can read more about the scope of this release in our news item about it, and you can download the files through the Geographic Crosswalks page.
One important note that I’ll copy here:
At this time, NHGIS crosswalks cover only pairs of years from different decades (e.g., 2012 and 2022, but not 2020 and 2022). If you need a crosswalk between 2020 and 2022 units in Connecticut, we recommend CTData’s 2020-2022 crosswalks for census tracts or blocks, or you can obtain a correspondence file between any 2020 census units and the 2022 Connecticut planning regions via Geocorr 2022