13,833 NCCI class code × US state rate cells sourced from state insurance department filings and rating-bureau publications.
Each row: an occupation classification (NCCI class code) + state combination, with the filed workers comp insurance rate per $100 of payroll.
This is the open-data dataset powering wcclasscode.com — the free workers comp rate database operated by Ordertoai LLC.
rate-cells.csv— 13,833 rows, CSV format with header row, ~1.8 MBrate-cells.json— same data, JSON array, ~4.5 MB
| Column | Type | Description |
|---|---|---|
code |
string | NCCI class code (e.g., "5403", "8810", "9079") |
occupation_primary |
string | Primary occupation classification name (NCCI Scopes manual) |
industry |
string | Higher-level industry grouping (construction, manufacturing, retail, etc.) |
state |
string | 2-letter US state code (e.g., "CA", "NY", "TX") |
state_name |
string | Full state name |
rate |
number | Filed rate per $100 of payroll, decimal |
rate_type |
string | Filing type: "loss cost", "base rate", "advisory", etc. |
effective_date |
string | When the rate took effect (YYYY-MM-DD) |
rating_authority |
string | Authority that filed the rate (NCCI, WCIRB for CA, NYCIRB for NY, etc.) |
is_top_50_code |
boolean | Whether this is in the top 50 most-common codes nationally |
state_is_indep_bureau |
boolean | True if state uses its own rating bureau (CA, NY, PA, NJ, etc.) |
state_is_monopolistic |
boolean | True if state has monopolistic-fund coverage (OH, WA, ND, WY) |
All 50 states + DC. Coverage varies by state because some states file fewer class codes than NCCI's national set:
- California (WCIRB): 498 codes filed
- Alabama (NCCI): 612 codes
- Alaska: 616 codes
- ... (full distribution in
rate-cells.csv)
- Building a workers comp premium estimator
- Comparing rates across states for a specific occupation
- Analyzing rate trends + filing patterns
- Industry-level rate analysis
- Academic / regulatory research
CC BY 4.0 — free to use, modify, redistribute with attribution to wcclasscode.com.
Browse the full database (with calculators, settlement charts, EMR explainers, and state-by-state coverage) at wcclasscode.com.
Rates are sourced from:
- State Department of Insurance public filings
- NCCI Scopes Manual (public)
- Independent rating bureau publications (WCIRB, NYCIRB, PCRB, NJCRIB, WCRIBMA, etc.)
- AM Best public ratings
Verified on a quarterly cycle. The full methodology, source citations, and confidence audit are at:
This dataset is operated by Ordertoai LLC (Texas LLC). Site: wcclasscode.com. Wikidata: Q139714089.
This data is provided for informational purposes only. Verify rates with your state's rating bureau or department of insurance before pricing a binding insurance quote. See the full disclaimer.
| Version | Date | Cells | Notes |
|---|---|---|---|
| 1.0 | 2026-05-12 | 13,833 | Initial public release |