HISDAC-US · 2010 census tracts · 1900–2020

Connecticut Built Over Time

New construction, fading over 10 yrs

a littlea building boom

Buildings per km², cumulative

Outline tracts where 40%+ of today's buildings have no build year, so their history is undercounted

Counts exist only for 1900, 1910 … 2020; the animation spreads each decade's growth evenly across its ten years. Only buildings standing in the 2010s are counted, so demolished structures never appear. Shading at 1900 is everything built before then.

Data: Berg, Leyk, Noi et al., Small-Area Summaries of the Historical Built Environment from HISDAC-US, v1.0. IPUMS NHGIS, 2026. doi.org/10.18128/D051.V1