What is in this file
One row per state, plus DC and Puerto Rico where available. The rank universe is 50 states; reference rows have an empty rank. The file is sorted by descending value with reference jurisdictions after the states.
- Period
- 2024
- Release
- 2025-09-11
- Updated
- 2026-10-23
- Producer
- U.S. Census Bureau
- Source
- ACS 1-year · GCT2503
- Units
- Percent
- Cadence
- Annual
Quick validation snapshot
Massachusetts has the highest estimate (30.2%); Nevada has the lowest (0.9%). The U.S. benchmark is 11.5%. These are useful checks when importing the CSV into a spreadsheet. Reference jurisdictions may lie outside the 50-state range, so exclude rows marked reference when reproducing the default state ranks.
Margins of error are 90% survey margins. Preserve them when reshaping the data; an empty cell and a numeric zero have different meanings.
Calculation and reproducibility
Published estimate; no transformation of the value.
Immutable edition 2026-10-23 CSV · Full edition registry, including available histories
Column definitions
| Column | Meaning |
|---|---|
| rank | 1 + the number of states with a higher source value; empty for reference rows. |
| jurisdiction | State name or labeled reference jurisdiction. |
| value | Numeric estimate, using the source’s available precision. |
| unit | Percent |
| moe_90 | Published 90% margin of error in the same units; empty when not published. |
| reference | True if excluded from the default 50-state ranking. |
| period | Reference period of the observation. |
| release | Date of the source release. |
| source | Producer and table/file identifier. |
| source_url | Producer file or source documentation; microdata rows link to the specific state input ZIP. |
Limits and reuse
Building age does not by itself establish condition, energy efficiency, or historic protection.
This is an independent arrangement of federal statistical data. Cite the named producer for the original observations and Rank the States for computed ranks. Downloading or embedding does not imply government endorsement. Source files are archived with a checksum for reproducibility.
SHA-256: ce98154a662c61218ef2f4097feb0ddadbf4e4bf3aff10f3d94ae177800d5fd5
Citation
Rank the States. Homes built before 1940, 2024. Source: U.S. Census Bureau, ACS 1-year, GCT2503; released 2025-09-11. Edition 2026-10-23. https://rankthestates.com/data/editions/2026-10-23/homes-built-before-1940.csv