Last Updated: December 27, 2024
Connecticut has redefined its county structure by adopting nine planning regions, known as Councils of Governments (COGs), as county-equivalent entities for statistical and administrative purposes. This change was approved by the U.S. Census Bureau in 2022 and is set for full implementation by 2024. Historically, Connecticut was divided into eight counties, but these counties were largely non-functional for administrative purposes. With the adoption of the nine COGs, the state’s administrative and statistical geography now aligns with these planning regions. These COGs are reflected in Maptitude Mapping Software.
Maptitude 2024 contains COG boundaries instead of the county boundaries. To locate your data by COG, you can do the following:
- In your spreadsheet, make sure there is a column for the COG and/or ANSI code, and State.
- In the Create a Map Wizard, you can match the County ANSI field to the ANSI code column in your Excel sheet and/or you can match the County Name field to the COG column in your Excel sheet.
- You can map the COG boundaries with your data attached or you can import your data as points.
You can refer to this look-up table to see which COG your counties correspond to:
| County | ANSI Code | COG (Council of Governments) | COG ANSI Code |
| Fairfield County | 09001 | Western Connecticut COG (WestCOG)/Greater Bridgeport COG (GBCOG) | 09190/09120 |
| Hartford County | 09003 | Capitol Region COG (CRCOG) | 09110 |
| Litchfield County | 09005 | Northwest Hills COG (NHCOG) | 09160 |
| Middlesex County | 09007 | Lower Connecticut River Valley COG (RiverCOG)/Naugatuck Valley COG (NVCOG) | 09130/09140 |
| New Haven County | 09009 | South Central Regional COG (SCRCOG) | 09170 |
| New London County | 09011 | Southeastern Connecticut COG (SECCOG) | 09180 |
| Tolland County | 09013 | Capitol Region COG (CRCOG) | 09110 |
| Windham County | 09015 | Northeastern Connecticut COG (NECCOG) | 09150 |
The conversion is not one-to-one, because there are more planning regions than there were counties. The approximated conversions above are sourced from the federal register.
Note: We have already enhanced the 2024 Block Group data by handling codes in two separate fields:
- Blockgroup: which contains the 2024 block group codes and the COG codes for Connecticut in place of county codes
- 2020 Blockgroup: which contains the 2020 block group codes from the Census Bureau and include Connecticut counties
You can also use your data to create county maps.