Connecticut 2010 and 2020 Census Tract to Town Crosswalk
This repository contains crosswalks between CT census tracts and towns in Connecticut for 2010 and 2020 Census. Note that some tracts cross town boundaries, therefore this crosswalk is approximate. This is usually the case for very small towns.
- The 2010 crosswalk (
2010/tract2town-2010.csvand2010/tract2town-2010.xlsx) contains 833 tracts. - The 2020 crosswalk (
2020/tract2town-2020.csvand2020/tract2town-2020.xlsx) contains 883 tracts matched to 169 towns; 5 of those census tracts (all coastal) are matched to County subdivisions not defined.
You can learn about the differences between 2010 and 2020 census tract boundaries for Connecticut in this blog post using an interactive map and a summary table.
| tract_fips | tract_name | town | county | town_fips |
|---|---|---|---|---|
| 09003405700 | 4057 | Bristol | Hartford | 0900308490 |
| 09003510200 | 5102 | East Hartford | Hartford | 0900322630 |
| 09003510400 | 5104 | East Hartford | Hartford | 0900322630 |
| 09015901100 | 9011 | Woodstock | Windham | 0901588190 |
| 09003510300 | 5103 | East Hartford | Hartford | 0900322630 |
To prevent Excel from transforming FIPS codes to numbers automatically (which leads to missing leading 0s), do the following:
- Open Excel, New workbook
- Go to File > Import > CSV file
- Choose file, and select "text" as type of tract_fips and town_fips columns
How it was generated
In QGIS, open census tract boundaries, generate one random point inside each polygon (using Point on surface command, not a centroid to account for concave shapes), and perform nearest neighbor spatial join (NNJoin plugin) to assign the "nearest" town.
Source datasets
- 2020 TIGER/Line Shapefiles: https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.2020.html
License
Released under MIT license. Feel free to use for any project. We will appreciate if you credited CTData Collaborative, although this is not required.