Census Disclosure Flags

Disclosure flags are how the Census Bureau publishes confidentiality-protected cells instead of hiding them. The County Business Patterns record for Automobile Dealers Establishments states it directly: "Employment and payroll values in small cells carry Census disclosure-noise flags (G/H/J/N) that users must respect when aggregating." The same record sets the granularity boundary — "NAICS detail to 6 digits where disclosure rules permit" — which tells you the flags and the industry depth are two sides of one rule. The practical reading: a flagged cell is not zero and not missing; it is a value the Bureau has perturbed or withheld, and any sum that treats it as either will be wrong at the margin.

Ignore the flags and market-sizing math quietly breaks: sums over small geographies or narrow merchandise lines inherit noise or missing cells, producing inflated or voided estimates for exactly the segments buyers care about. County Business Patterns publishes NAICS detail to 6 digits only where disclosure rules permit. 1,495 of the 1,744 cataloged datasets have verified field definitions (85.7%) — confidentiality handling deserves the same scrutiny as schema.

Use these checks before you rely on a source's treatment of this term:

1. Ask any vendor how they handle flagged cells — drop, impute or pass through — before trusting their sub-county totals.
2. Check NAICS depth claims against the disclosure rule: County Business Patterns publishes detail to 6 digits only where disclosure rules permit.
3. Reconcile any narrow-geography sum against county-level totals to see how much the G/H/J/N cells moved the answer.
4. Prefer sources that publish the flags rather than silently suppressing cells, since a visible flag lets you bound the error.

Where to see it in context: automotive-retail data, consumer-staples-merchandise-retail data.

• county-business-patterns — the program whose automobile dealers record documents the G/H/J/N flags.
• employment-size-class — the size bands that determine when cells get small enough to flag.
• title-13-confidentiality — the law that makes the noise flags necessary.