Stacker County Rankings Map Where Pre-War Homes Concentrate Across the U.S.

The new state-by-state lists use 2023 Census estimates to spotlight counties with high shares of homes built before 1939 versus places with large absolute counts.

Overview

Stacker ranked counties by the percentage of homes built in 1939 or earlier using U.S. Census Bureau 2023 five-year estimates.
Arizona’s update lists Cochise County at #1 with 6.9% pre-war homes, or 4,100 residences, based on the latest county breakdown.
California’s leader by share is San Francisco County at 45.4% pre-war homes, totaling 186,855, while Los Angeles County holds the largest inventory with 520,428 pre-war homes at 14.4%.
Colorado’s top share belongs to San Juan County at 36.8%, equal to 265 homes, illustrating how small housing stocks can yield high percentages.
Many pre-war properties require local historic-commission approval for alterations, and renovation planning often accounts for legacy hazards such as asbestos and lead.