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README.md

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+---
+license: mit
+task_categories:
+  - tabular-classification
+  - tabular-regression
+tags:
+  - immigration
+  - h1b
+  - perm
+  - labor
+  - visas
+  - dol
+pretty_name: DOL H-1B LCA & PERM Labor Certification Database
+size_categories:
+  - 1M<n<10M
+---
+
+# DOL Visas Database (H-1B LCA + PERM)
+
+Every H-1B/H-1B1/E-3 Labor Condition Application and PERM permanent labor
+certification application disclosed by the DOL Office of Foreign Labor
+Certification, FY2015 to present, as a single queryable DuckDB database.
+**8,533,076 rows.**
+
+| Table | Description | Rows | Cols | Coverage |
+|-------|-------------|------|------|----------|
+| `lca` | H-1B/H-1B1/E-3 Labor Condition Applications, one row per application per disclosure file, FY2015-present | 7,252,588 | 110 | FY2015 to FY2026 |
+| `perm` | PERM permanent labor certification applications, one row per application per disclosure file, FY2015-present | 1,280,488 | 73 | FY2015 to FY2026 |
+
+## Query it remotely
+
+```sql
+INSTALL httpfs; LOAD httpfs;
+ATTACH 'https://huggingface.co/datasets/Nason/dol-visas-database/resolve/main/dol_visas.duckdb'
+    AS visas (READ_ONLY);
+
+SELECT employer_name, COUNT(*) AS certified_lcas
+FROM visas.lca
+WHERE fiscal_year = 2025 AND case_status = 'CERTIFIED' AND is_latest
+GROUP BY 1 ORDER BY 2 DESC LIMIT 10;
+```
+
+Or with the datapond package: `pip install datapond`, then
+`datapond.connect('dol-visas')`.
+
+Build pipeline, per-era column crosswalks, and full documentation:
+https://github.com/ian-nason/dol-visas-database
+
+
+# Changelog
+
+## 2026-07-07 — Initial release
+
+- `lca`: H-1B/H-1B1/E-3 Labor Condition Applications, FY2015 through
+  FY2026-to-date (~7.25M rows, 106 harmonized columns from 4 source-layout
+  eras).
+- `perm`: PERM labor certification applications, FY2015 through
+  FY2026-to-date (~1.28M rows, 69 curated analytical columns from 3 form
+  eras; remaining source columns documented as drops in the crosswalk).
+- All disclosure rows kept; `is_latest` flags the most recent appearance of
+  each case number per program.
+- Categorical domains normalized across eras (case_status casing, wage
+  levels, Y/N flags, literal 'NULL' strings).
+- Known upstream limits: FY2024+ PERM form drops citizenship/admission-class
+  and foreign-worker education fields; FY2019 LCA secondary worksite groups
+  (2-10) not retained; H-2A/H-2B/CW-1/prevailing-wage files out of scope.